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ORIGINAL RESEARCH article

Front. Aging Neurosci., 05 January 2017
Sec. Neurocognitive Aging and Behavior
This article is part of the Research Topic Mood and Cognition in Old Age View all 17 articles

Reciprocal Associations between Depressive Symptoms and Mastery among Older Adults; Black-White Differences

  • 1Department of Psychiatry, University of Michigan, Ann Arbor, MI, USA
  • 2Center for Research on Ethnicity, Culture and Health, School of Public Health, University of Michigan, Ann Arbor, MI, USA
  • 3Medicine and Health Promotion Institute, Tehran, Iran

Purpose: Although higher levels of depressive symptoms and lower levels of sense of mastery tend to be comorbid, limited information exists on racial differences in the longitudinal associations between the two over time. The current study compared Black and White American older adults for the longitudinal links between depressive symptoms and mastery in the United States.

Methods: Using data from the Religion, Aging, and Health Survey, 2001–2004, this longitudinal cohort study followed 1493 Black (n = 734) and White (n = 759) elderly individuals (age 66 or more) for 3 years. Depressive symptoms [Center for Epidemiological Studies-Depression scale (CES-D), 8 items] and mastery (Pearlin Mastery Scale, 7 items) were measured in 2001 and 2004. Demographics, socio-economics, and physical health were covariates and race was the focal moderator. Multi-group structural equation modeling was used for data analysis, where groups were defined based on race.

Results: Among White but not Black older adults, higher levels of depressive symptoms at baseline predicted a greater decline in sense of mastery over 3 years of follow-up. Similarly among Whites but not Blacks, individuals with lower mastery at baseline developed more depressive symptoms over time.

Conclusion: Findings are indicative of Black-White differences in reciprocal associations between depressive symptoms and mastery over time. Race alters how depression is linked to changes in evaluation of self (e.g., mastery) over time.

Introduction

According to the Black-White health paradox, one of the mysteries of health research (Keyes, 2009; Barnes et al., 2013; Mouzon, 2013, 2014; Assari et al., 2015; Watkins et al., 2015), despite higher exposure to psychosocial and economic stress and adversities, Blacks less frequently meet criteria for depression compared to Whites (Owen, 1996; Lindhorst et al., 2007; Signorello et al., 2007; Williams et al., 2007; González et al., 2010; Cabassa et al., 2013; Jackson et al., 2013; Johnson-Lawrence et al., 2013). In line with this paradox, Blacks and Whites differ in psychosocial and health factors that correlate with depression and depressive symptoms (Sachs-Ericsson et al., 2007; Gavin et al., 2010; Lewis et al., 2011; Barnes et al., 2013; Capistrant et al., 2013; Assari and Lankarani, 2014; Assari, 2014d; Assari et al., 2016b). This hypothesis is supported by research showing that depression increases the risk of chronic medical conditions among Whites but not Blacks (Assari et al., 2015, 2016a). Depressive symptoms predict chronic medical conditions (Assari et al., 2015) and all-cause (Assari et al., 2016a; Moazen-Zadeh and Assari, 2016) and cause-specific (Assari and Burgard, 2015) mortality among Whites but not Blacks. In another set of studies, depressive symptoms have failed to correlate with expected biological markers, such as inflammatory markers (Case, 2014; Stewart, 2016; Vrany et al., 2016).

The first possible explanation proposed by Keyes for the Black-White health paradox is that Blacks may experience some levels of growth or flourishing in the presence of adversities (Keyes, 2009). Assari has found that Blacks are systematically more resilient to the effects of psycho-social factors, which may reflect an adaptive resilience of Blacks as a result of life under economic and social adversity, or culture (Krause, 2002; Assari et al., 2016c; Assari, 2016a,b,c; Assari and Lankarani, 2016b; Assari and Dejman, 2016). These two explanations are supported by studies documenting higher availability and efficacy of interpersonal psychosocial resources, such as social support and religion, for Blacks than Whites (Lincoln et al., 2003; Keyes, 2009; Barnes et al., 2013; Mouzon, 2013, 2014; Assari et al., 2015). Jackson has suggested that Blacks use behavioral coping mechanisms that lower the risk of emotional problems, however, increase the risk of metabolic and cardiovascular conditions (Jackson and Knight, 2006; Mezuk et al., 2010, 2013).

There are also a series of methodological explanations that attribute this paradox to measurement errors or selection biases. For instance, some evidence suggests that depression measures that are designed and validated for Whites fail to capture depression in Blacks (Moazen-Zadeh and Assari, 2016). In one study, baseline depressive symptoms were predictive of the subsequent risk of Major Depressive Disorder (MDD) after 15 years among Whites but not Blacks (Moazen-Zadeh and Assari, 2016). This view is also supported by the literature suggesting lower validity of depressive measures among Blacks (Williams et al., 2007) as well as studies that depression may differently present among Blacks and Whites (Brown et al., 1996; Blazer et al., 1998; Zayas et al., 2002).

The third generation of explanations recently proposed by Assari is that depression differently influences dysfunctional attitudes about self (e.g., mastery), others, and the future (e.g., Hope) (Assari, 2016a; Assari and Lankarani, 2016a; Assari and Dejman, 2016). In this view, depression is qualitatively different among Blacks and Whites; thus Blacks and Whites may differ in the link between depression and mastery, defined as a sense of having control over the forces that affect one's life (Fok et al., 2012). We argue that high levels of psychosocial resources, such as social support and religion, may make Blacks more resistant to decline in mastery in the face of social adversities (Lincoln et al., 2003; Assari, 2013; Mouzon, 2013, 2014). Level of mastery will have implications on how stress may affect depression among Blacks and Whites (Assari and Lankarani, 2016c). This view is also supported by studies suggesting that locus of control, mastery, self-efficacy, and control over life may not have similar meanings in Whites and Blacks (Deaton and Lubotsky, 2003; Dressler et al., 2005; Dowd and Zajacova, 2007; Assari, 2014c, 2016e; Assari et al., 2016c). In a number of studies, Assari has shown that depression differently influences dysfunctional attitudes about self, others, and the future (Assari, 2016a; Assari and Lankarani, 2016a; Assari and Dejman, 2016). For instance, lower levels of these control beliefs may have more significant health consequences for Whites than Blacks (Assari, 2016c).

Built on the differential effect hypothesis (Assari, 2016b,d; Assari and Lankarani, 2016b; Assari and Sonnega, 2016), we conducted the current study to compare Black and White American older adults for the reciprocal longitudinal associations between depressive symptoms and mastery over time. This hypothesis is in line with what Belsky and others have called ‘differential susceptibility to environmental influences’ or ‘differential susceptibility to the context’ (Belsky, 1997; Boyce and Ellis, 2005; Belsky et al., 2007; Belsky and Pluess, 2009). Given that previous studies have shown that religion and social support may be more available and effective for Blacks compared to Whites (Krause, 2006a; Skarupski et al., 2013) paired with the finding that Blacks are more resilient to the effect of psychosocial factors (Krause, 2002; Assari, 2016a,b,c; Assari and Lankarani, 2016b; Assari and Dejman, 2016; Assari et al., 2016c), we expected to observe weaker reciprocal longitudinal links between depressive symptoms and mastery among Blacks compared to Whites. We used nationally representative data to generate results that are generalizable to the U.S. population of older adults.

Methods

Design and Setting

With a longitudinal panel design, data came from Waves 1 and 2 of the Religion, Aging, and Health Survey, 2001–2004. The study is a 3 year follow up of a nationally representative household sample of Black and White older adults in the U.S. (Krause, 2006b, 2009).

Sampling and Participants

The study participants were either White or Black older adults. Older Blacks were over-sampled in the survey. All participants were non-institutionalized English speaking people of ages greater than 65 years. The study population was limited to those who were either Christians or those who were never associated with any faith.

Measures

Race, demographic data (age and gender), and socio economic status (education) were measured at baseline in 2001. Number of chronic medical conditions (13 chronic medical conditions) was measured in 2004. Depressive symptoms and mastery were measured in 2001 and 2004.

Depressive Symptoms

An 8–item Center for Epidemiological Studies-Depression scale (CES-D) (Radloff, 1977) was used to measure depressive symptoms in 2001 and 2004. Items measured the extent to which respondents felt depressed or had somatic symptoms. Abbreviated CES-D measures have shown acceptable reliability and similar validity as compared to the original 20–item version (Andresen et al., 1994; Zhang et al., 2012; Amtmann et al., 2014). Items used were as the following: (1) I felt I could not shake off the blues even with the help of my family and friends, (2) I felt depressed, (3) I had crying spells, (4) I felt sad, (5) I did not feel like eating, my appetite was poor, (6) I felt that everything I did was an effort, (7) My sleep was restless, and (8) I could not get going. All these items were selected from the negative domain of the CES-D; positive affect and interpersonal items were not reflected in this version of the CES-D. Item responses were 1 (“rarely or none”) to 4 (“most or all of the time”). We calculated the mean score which treated depressive symptoms as a continuous measure, with a potential range from 1 to 4. Higher scores indicated more severe depressive symptoms. (Abu-Raiya et al., 2016; Hayward and Krause, 2016)

Mastery

We used seven items from the Pearlin Mastery Scale (Cairney and Krause, 2008). Items included (1) You have little control over the things that happen to you, (2) There is really no way you can solve some of the problems you have, (3) There is little you can do to change many of the important things in your life, (4) Sometimes you feel that you are being pushed around in life, (5) What happens to you in the future mostly depends upon you, (6) You can do just about anything you really set your mind to, and (7) You often feel helpless in dealing with the problems of life (Pearlin and Pioli, 2003). This construct is similar to sense of control (Wheaton, 1983; Rodin, 1986; Mirowsky, 1995, 1997). We calculated a mean score where a higher score was indicative of a greater sense of mastery (range = 0–4). Some of the items were reverse coded. The internal reliability of the scale (Cronbach's alpha) at Wave 1 was 0.94.

Number of Chronic Medical Conditions

The presence of the following chronic medical conditions were measured during the past 12 months: (1) hypertension, (2) heart problem, (3) diabetes, (4) cancer, (5) kidney disease, (6) arthritis or rheumatism, (7) intestinal disorders, (8) liver disease, (9) urinary tract disorders, (10) eye diseases, (11) any respiratory disease, and (12) any other major health problem. Possible responses included yes [1], no [0], and do not know (missing data). Number of conditions potentially ranged between 0 and 12, where a higher score was indicative of more chronic conditions. (Watkins et al., 2015) We decided to control for chronic medical conditions as physical health is correlated with mastery and depressive symptoms and may confound their link. Medical conditions may, however, be differently linked to depression based on race (MacKinnon et al., 2000; Lynch et al., 2010; Lewis et al., 2011; Barnes et al., 2013; Capistrant et al., 2013; Assari and Burgard, 2015; Assari et al., 2015).

Statistical Analysis

We used SPSS 20.0 (IBM Corp, Armonk, NY) for univariate and bivariate analyses. We used AMOS 20 (IBM Corp, Armonk, NY) for multivariable analysis. For bivariate associations, Pearson's correlations tests, independent sample t-tests, and paired t-tests were used. For multivariable analysis, we ran multi-group structural equation modeling (SEM) to test if baseline depressive symptoms and mastery predict subsequent depressive symptoms and mastery, while age, education, gender, and chronic medical conditions were controlled. We ran a multi-group model where groups were defined based on race (Kline, 2010). P < 0.05 was considered significant.

The Amos software computes maximum likelihood estimates in the presence of missing data (Allison, 2002; Arbuckle, 2012). Model fit was evaluated by examining the chi-square statistic, the comparative fit index (CFI), and the root mean square error of approximation (RMSEA). A non-significant chi-square statistic, a chi-square to degrees of freedom ratio of less than 4, a CFI above 0.95, and a RMSEA value of 0.06 or less were considered as indicators of good fit (Hu and Bentler, 1999; Lei and Lomax, 2005).

Results

Descriptive statistics

The study followed 1493 older adults (age 65 or greater) for 3 years. This sample included 734 Blacks and 759 Whites. Descriptive statistics overall and also based on race are shown in Table 1. While age was not significantly different between the racial groups, Blacks were more female, and had lower education. Blacks reported more depressive symptoms than Whites.

TABLE 1
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Table 1. Descriptive Statistics for the analytic sample, stratified by race and overall.

Multivariable Model

Our model showed an excellent fit to the data (p = 0.468, CMIN = 1.519, DF = 2, CMIN/DF = 0.759, CFI = 1.000, RMSEA = 0.000, 90% CI = 0.000–0.057; Figures 1, 2). Depressive symptoms at baseline was associated with decline in mastery over time among Whites (β = 0.10, p = 0.013) but not Blacks (β = 0.04, p = 0.369). Mastery at baseline was also predictive of an increase in depressive symptoms over time among Whites (β = 0.11, p = 0.007) but not Blacks (β = 0.05, p = 0.255). Baseline age and gender were associated with change in depressive symptoms for Whites but not Blacks. Number of medical conditions was predictive of change in mastery and depressive symptoms among Whites and Blacks (Table 2, Figures 1, 2).

FIGURE 1
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Figure 1. Standardized regression weights for longitudinal associations between depressive symptoms and mastery over 3 years among White older adults from 2001 to 2004. P = 0.468, CMIN = 1.519, DF = 2, CMIN/DF = 0.759, CFI = 1.000, RMSEA = 0.000, 90% CI = 0 000–0.057.

FIGURE 2
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Figure 2. Standardized regression weights for longitudinal associations between depressive symptoms and mastery over 3 years among Black older adults from 2001 to 2004. P = 0.468, CMIN = 1.519, DF = 2, CMIN/DF = 0.759, CFI = 1.000, RMSEA = 0.000, 90% CI = 0.000–0.057.

TABLE 2
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Table 2. Longitudinal associations between depressive symptoms and mastery over 3 years among White and Black older adults.

Discussion

In a nationally representative sample of older adults in U.S., we found that sense of mastery and depressive symptoms have reciprocal links among Whites but not Blacks. These Black-White differences are in line with other racial differences in psychosocial and medical correlates of depression (Sachs-Ericsson et al., 2007; Gavin et al., 2010; Lewis et al., 2011; Capistrant et al., 2013; Assari and Lankarani, 2014; Assari, 2014d; Assari and Burgard, 2015; Assari et al., 2015, 2016a,b,c; Watkins et al., 2015; Moazen-Zadeh and Assari, 2016) that collectively support the differential effect hypothesis and differential susceptibility to context.

These findings enhance our understanding regarding the relevance of Beck's negative cognitive triad to racially diverse groups. Based on Beck's theory, depression is a dysfunctional evaluation of self, others, and the future (Beck et al., 1990). It has been previously shown that depression and hopelessness (dysfunctional evaluation of the future) have stronger links among Whites than Blacks (Assari and Lankarani, 2016a). These findings suggest that race may alter how distorted evaluation of self, others, and the future reflects depression among populations. These findings have major clinical implications for psychotherapy and cognitive therapy of depression in diverse populations (Assari and Lankarani, 2016a).

Lincoln (Lincoln et al., 2003) and others (Assari, 2013; Assari, under review) have argued that social and psychological factors operate differently across racial and ethnic groups. Psychosocial processes may operate in unique manners that are distinct across each racial and ethnic group (Lincoln et al., 2003). In this view, the assumption of similarity between Blacks and Whites is the result of an absence of previous studies on race/ethnic differences, and does not have empirical evidence (Hunt, 1996; Hunt et al., 2000; Lincoln et al., 2003; McDowell, 2010; Assari, 2016c). Our findings suggest that the psychosocial processes that result in depression may depend on race.

Racial groups have unique histories, values, and cultures, which combine with life circumstances and experiences that make them differently vulnerable or resilient to risk and protective factors. In this view, the very same social factors, and the very same psychosocial theory may differently operate across all social groups (Lincoln et al., 2003). Understanding of group differences in psychosocial processes that contribute to health and illness is essential for the promotion of health and wellbeing through altering social or psychological factors across diverse populations (Lincoln et al., 2003). This argument is core to the differential effect hypothesis (Assari, 2016d).

It has been shown that overall social support and support from fellow church members are stronger predictive factors against psychological distress and depressive symptoms among Blacks compared to Whites (Lincoln et al., 2003; Krause, 2006a; Assari and Burgard, 2015; Assari, under review). In 2013, Assari showed that religious (church-based) social support fully mediated the association between church attendance and overall life satisfaction for Blacks but not Whites (Assari, 2013). These are all in line with what Skarupski et al., called the Blacks' “faith advantage in health” (Skarupski et al., 2013).

Our finding adds to the existing knowledge on racial differences in the complex associations between socioeconomic status (SES), psychosocial resources (e.g., social support, coping, stress), depression, and health (Drevenstedt, 1998; Krause, 2002; Sachs-Ericsson et al., 2007; Cheng et al., 2010; Gariepy et al., 2010; Gavin et al., 2010; Cohen et al., 2012; Flegal et al., 2013; Assari, 2014a,b; Patel et al., 2014; Assari et al., 2016c). Race modifies how SES affects depression, health behaviors, and mortality (Flegal et al., 2013; Patel et al., 2014) and how depression is linked to obesity (Sachs-Ericsson et al., 2007; Gavin et al., 2010; Assari, 2014a,b), chronic medical conditions (Assari and Lankarani, 2014; Watkins et al., 2015), self-rated health (Assari, 2014d; Assari and Burgard, 2015; Assari et al., 2015), and mortality (Assari and Burgard, 2015; Assari et al., 2016a).

Race differences in vulnerabilities to the effect of risk and protective factors may be a consequence of racial differences in exposure to psychosocial risk and protective factors (Ferraro and Kelley-Moore, 2001; Lee et al., 2007; Assari and Burgard, 2015; Assari et al., 2016c), race differences in the nature of depression or mastery (Moazen-Zadeh and Assari, 2016), or racial differences in what psychosocial constructs reflect (Assari et al., 2016c). These non-specific racial differences suggest that race does not have a direct effect on health, or simply through SES, but has contextual effects that alter how resources and risk factors impact physical or mental health (Capistrant et al., 2013; Assari, 2014a,c,d, 2015; Assari et al., 2015, 2016c).

The missing link between depressive symptoms and mastery among Blacks may explain why depressive symptoms have weaker effects on self-rated health, medical conditions, and mortality among Blacks compared to Whites (Drevenstedt, 1998; Ferraro and Kelley-Moore, 2001; Dowd and Zajacova, 2007; Lee et al., 2007; Assari and Burgard, 2015; Assari et al., 2016d). In a consistent pattern, regardless of the type of the predictor, psychological variables better predict physical and mental health outcomes for Whites compared to Blacks (Ferraro and Kelley-Moore, 2001; Dowd and Zajacova, 2007; Lee et al., 2007; Assari, 2016e). These suggest higher resilience of Blacks toward different risk factors, possibly due to historical exposure to adversity.

Our findings may have implications for the elimination of racial health disparities in the US, which have existed for several decades (Deaton and Lubotsky, 2003; Dressler et al., 2005). This finding may also be relevant to the ongoing increasing trends of mortality due to mental disorders, depression, and alcohol use among White men (Case and Deaton, 2015). We believe that mastery is central to trajectories of mental disorders and chronic disease, particularly for Whites.

Our study is subject to a number of limitations. First and foremost, we measured depressive symptoms, not major depressive disorder, which would have required a structural interview. We also did not measure history of anti depressant use, which affects the course of depression. Third, we did not control for potential confounders, such as stress, religiosity, social support, and cognitive ability. Fourth, we used short versions of standard measures of mastery and depressive symptoms. Despite these limitations, this study was one of the firsts on racial differences in the links between mastery and depressive symptoms over time among older adults. Using a nationally representative sample and large sample size of Blacks can be listed as strengths of this study.

To conclude, race alters the reciprocal and longitudinal associations between depressive symptoms and sense of mastery over time. Black-White differences in the link between depression and mastery may explain why depression and depressive symptoms better predict chronic medical conditions and mortality among Whites than Blacks. Future research should test whether racial differences in the paths between depression and mastery is due to racial differences in quality of depression and control beliefs, racial differences in availability and effects of psychosocial factors (e.g., SES, religiosity, and social support) or differential salience of dysfunctional attitudes about self, others, and the future explain these differences between Blacks and Whites.

Ethics Statement

All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) with the Helsinki Declaration of 1975, as revised in 2000. Informed consent was obtained from all participants included in the study. The University of Michigan Institutional review board (IRB) approved the study protocol.

Author Contributions

SA designed and analyzed this work, and contributed to revision. ML drafted and revised the paper. Both authors confirmed the last version.

Funding

The Religion, Aging, and Health Survey was supported by National Institute on Aging (PI: Neal Krause R01 AG014749), and per the NIH Public Access Policy requires that peer-reviewed research publications generated with NIH support are made available to the public through PubMed Central. NIH is not responsible for the data collection or analyses represented in this article. Data was accessed through The Interuniversity Consortium for Political and Social Research (ICPSR), the Institute of Social Research, University of Michigan.

Conflict of Interest Statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Acknowledgments

SA is supported by the Heinz C. Prechter Bipolar Research Fund and the Richard Tam Foundation at the University of Michigan Depression Center.

References

Abu-Raiya, H., Pargament, K. I., and Krause, N. (2016). Religion as problem, religion as solution: religious buffers of the links between religious/spiritual struggles and well-being/mental health. Qual. Life Res. 25, 1265–74. doi: 10.1007/s11136-015-1163-8

PubMed Abstract | CrossRef Full Text | Google Scholar

Allison, P. D. (2002). “Missing data,” in Sage University Papers Series on Quantitative. Applications in the Social Sciences, Series (Thousand Oaks, CA: Sage), 7–136.

PubMed Abstract

Amtmann, D., Kim, J., Chung, H., Bamer, A. M., Askew, R. L., Wu, S., et al. (2014). Comparing CESD-10, PHQ-9, and PROMIS depression instruments in individuals with multiple sclerosis. Rehabil. Psychol. 59, 220–229. doi: 10.1037/a0035919

PubMed Abstract | CrossRef Full Text | Google Scholar

Andresen, E. M., Malmgren, J. A., Carter, W. B., and Patrick, D. L. (1994). Screening for depression in well older adults: evaluation of a short form of the CES-D (Center for Epidemiologic Studies Depression Scale). Am. J. Prev. Med. 10, 77–84.

PubMed Abstract | Google Scholar

Arbuckle, A. J. (2012). Amos 20 User's Guide. Crawfordville, FL: Amos Development.

Assari, D., Dejman, M., and Neighbors, H. W. (2016d). Ethnic differences in separate and additive effects of anxiety and depression on self rated mental health among blacks. J. Racial. Ethn. Health Disparities. 3, 423–430. doi: 10.1007/s40615-015-0154-3

PubMed Abstract | CrossRef Full Text | Google Scholar

Assari, S. (2013). Race and ethnicity, religion involvement, church-based social support and subjective health in United States: a case of moderated mediation. Int. J. Prev. Med. 4, 208–217.

PubMed Abstract | Google Scholar

Assari, S. (2014a). Additive effects of anxiety and depression on body mass index among blacks: role of ethnicity and gender. Int. Cardiovasc. Res. J. 8, 44–51

PubMed Abstract | Google Scholar

Assari, S. (2014b). Association between obesity and depression among American Blacks: role of ethnicity and gender. J. Racial Ethn. Health Disparities 1, 36–44. doi: 10.1007/s40615-014-0007-5

CrossRef Full Text | Google Scholar

Assari, S. (2014c). Cross-country variation in additive effects of socio-economics, health behaviors, and comorbidities on subjective health of patients with diabetes. J. Diabetes Metab. Disord. 13:36. doi: 10.1186/2251-6581-13-36

PubMed Abstract | CrossRef Full Text | Google Scholar

Assari, S. (2014d). Separate and combined effects of anxiety, depression and problem drinking on subjective health among black, hispanic and non-hispanic white men. Int. J. Prev. Med. 5, 269–279.

PubMed Abstract | Google Scholar

Assari, S. (2015). Cross-country differences in the additive effects of socioeconomics, health behaviors and medical comorbidities on disability among older adults with heart disease. J. Tehran Heart Cent. 10, 24–33.

PubMed Abstract | Google Scholar

Assari, S. (2016a). Association between self-esteem and depressive symptoms is stronger among black than white older adults. J. Racial Ethnic Health Disparit. doi: 10.1007/s40615-016-0272-6. [Epub ahead of print].

PubMed Abstract | CrossRef Full Text | Google Scholar

Assari, S. (2016b). Combined racial and gender differences in the long-term predictive role of education on depressive symptoms and chronic medical conditions. J. Racial Ethn. Health Disparit. 4, 1–10. doi: 10.1007/s40615-016-0239-7

PubMed Abstract | CrossRef Full Text | Google Scholar

Assari, S. (2016c). Race, sense of control over life, and short-term risk of mortality among older adults in the United States. Arch. Med. Sci. 8. doi: 10.5114/aoms.2016.59740

CrossRef Full Text | Google Scholar

Assari, S. (2016d). Race and ethnic differences in additive and multiplicative effects of depression and anxiety on cardiovascular risk. Int. J. Prevent. Med. 7, 22. doi: 10.4103/2008-7802.173931

PubMed Abstract | CrossRef Full Text | Google Scholar

Assari, S. (2016e). Hostility and cardiovascular mortality among blacks and whites. Res. Cardiovas. Med. doi: 10.5812/cardiovascmed.34029

CrossRef Full Text | Google Scholar

Assari, S., and Burgard, S. (2015). Black-White differe nces in the effect of baseline depressive symptoms on deaths due to renal diseases: 25 year follow up of a nationally representative community sample. J. Renal. Inj. Prev. 4, 127–134. doi: 10.12861/jrip.2015.27

PubMed Abstract | CrossRef Full Text | Google Scholar

Assari, S., Burgard, S., and Zivin, K. (2015). Long-term reciprocal associations between depressive symptoms and number of chronic medical conditions: longitudinal support for black–white health paradox. J. Racial Ethn. Health Disparit. 2, 589–597. doi: 10.1007/s40615-015-0116-9

PubMed Abstract | CrossRef Full Text | Google Scholar

Assari, S., and Dejman, M. (2016). Heterogeneity of the Link between Depression and Self-Esteem based on Race. Caspian J. Neurol. Sci. 2, 7–21.

Google Scholar

Assari, S., and Lankarani, M. M. (2014). Race and ethnic differences in associations between cardiovascular diseases, anxiety, and depression in the United States. In. J. Travel Med. Global Health 2, 107–113.

Assari, S., and Lankarani, M. M. (2016c). Association between stressful life events and depression; intersection of race and gender. J. Racial Ethn. Health Disparit. 3, 349–356. doi: 10.1007/s40615-015-0160-5

PubMed Abstract | CrossRef Full Text | Google Scholar

Assari, S., and Lankarani, M. M. (2016a). Depressive symptoms are associated with more hopelessness among white than black older adults. Front. Public Health. 4:82. doi: 10.3389/fpubh.2016.00082

PubMed Abstract | CrossRef Full Text | Google Scholar

Assari, S., and Lankarani, M. M. (2016b). Race and urbanity alter the protective effect of education but not income on mortality. Front. Public Health 4:100. doi: 10.3389/fpubh.2016.00100

PubMed Abstract | CrossRef Full Text | Google Scholar

Assari, S., Lankarani, M. M., and Burgard, S. (2016c). Black white difference in long term predictive power of self-rated health on all-cause mortality in United States. Ann. Epidemiol. 26, 106–114. doi: 10.1016/j.annepidem.2015.11.006

PubMed Abstract | CrossRef Full Text | Google Scholar

Assari, S., Moazen-Zadeh, E., Lankarani, M. M., and Micol-Foster, V. (2016a). Race, depressive symptoms, and all-cause mortality in the United States. Front Public Health 4:40. doi: 10.3389/fpubh.2016.00040

PubMed Abstract | CrossRef Full Text | Google Scholar

Assari, S., and Sonnega, A. (2016). Racial differences in the predictive role of high depressive symptoms on incident heart disease over 18 years: results from the Health and Retirement Study. Res. Cardiovasc. Med. 8:e34767. doi: 10.5812/cardiovascmed.34767

CrossRef Full Text | Google Scholar

Assari, S., Sonnega, A., Pepin, R., and Leggett, A. (2016b). Residual effects of restless sleep over depressive symptoms on chronic medical conditions: race by gender differences. J. Racial Ethn. Health Disparit. doi: 10.1007/s40615-015-0202-z. [Epub ahead of print].

PubMed Abstract | CrossRef Full Text | Google Scholar

Barnes, D. M., Keyes, K. M., and Bates, L. M. (2013). Racial difference s in depression in the United States: how do subgroup analyses inform a paradox? Soc. Psychiatry Psychiatr. Epidemiol. 48, 1941–1949. doi: 10.1007/s00127-013-0718-7

PubMed Abstract | CrossRef Full Text | Google Scholar

Beck, A. T., Brown, G., Berchick, R. J., Stewart, B. L., and Steer, R. A. (1990). Relationship between hopelessness and ultimate suicide: a replication with psychiatric outpatients. Am. J. Psychiatry 147, 190–195. doi: 10.1176/ajp.147.2.190

PubMed Abstract | CrossRef Full Text

Belsky, J. (1997). Variation in susceptibility to rearing influences: an evolutionary argument. Psychol. Inquiry 8, 182–186. doi: 10.1207/s15327965pli0803_3

CrossRef Full Text | Google Scholar

Belsky, J., Bakermans-Kranenburg, M. J., and Van IJzendoorn, M. H. (2007). For better and for worse differential susceptibility to environmental influences. Curr. Direct. Psychol. Sci. 16, 300–304. doi: 10.1111/j.1467-8721.2007.00525.x

CrossRef Full Text

Belsky, J., and Pluess, M. (2009). Beyond diathesis stress: differential susceptibility to environmental influences. Psychol. Bull. 135, 885–908. doi: 10.1037/a0017376

PubMed Abstract | CrossRef Full Text | Google Scholar

Blazer, D. G., Landerman, L. R., Hays, J. C., Simonsick, E. M., and Saunders, W. B. (1998). Symptoms of depression among community-dwelling elderly African-American and white older adults. Psychol. Med. 28, 1311–1320. doi: 10.1017/S0033291798007648

PubMed Abstract | CrossRef Full Text | Google Scholar

Boyce, W. T., and Ellis, B. J. (2005). Biological sensitivity to context: I. an evolutionary-developmental theory of the origins and functions of stress reactivity. Dev. Psychopathol. 17, 271–301. doi: 10.1017/S0954579405050145

PubMed Abstract | CrossRef Full Text | Google Scholar

Brown, C., Schulberg, H. C., and Madonia, M. J. (1996). Clinical pres entations of major depression by African Americans and whites in primary medical care practice. J. Affect. Disord. 41, 181–191. doi: 10.1016/S0165-0327(96)00085-7

PubMed Abstract | CrossRef Full Text | Google Scholar

Cabassa, L. J., Humensky, J., Druss, B., Lewis-Fernández, R., Gomes, A. P., Wang, S., et al. (2013). Do race, ethnicity, and psychiatric diagnoses matter in the prevalence of multiple chronic medical conditions? Med. Care. 51, 540–547. doi: 10.1097/MLR.0b013e31828dbb19

PubMed Abstract | CrossRef Full Text | Google Scholar

Cairney, J., and Krause, N. (2008). Negative life events and age-related decline in mastery: are older adults more vulnerable to the control-eroding effect of stress? J. Gerontol. B Psychol. Sci. Soc. Sci. 63, S162–S170. doi: 10.1093/geronb/63.3.S162

PubMed Abstract | CrossRef Full Text | Google Scholar

Capistrant, B. D., Gilsanz, P., Moon, J. R., Kosheleva, A., Patton, K. K., and Glymour, M. M. (2013). Does the association between depressive symptoms and cardiovascular mortality risk vary by race? evidence from the health and retirement study. Ethn. Dis. 23, 155–160.

PubMed Abstract | Google Scholar

Case, A., and Deaton, A. (2015). Rising morbidity and mortality in midlife among white non-hispanic Americans in the 21st century. Proc. Natl. Acad. Sci. U.S.A. 12, 15078–15083. doi: 10.1073/pnas.1518393112

PubMed Abstract | CrossRef Full Text | Google Scholar

Case, S. M. (2014). Stewart, JC Race/ethnicity moderates the relationship between depressive symptom severity and C-reactive protein: 2005-2010 NHANES data. Brain Behav. Immun. 41, 101–108 doi: 10.1016/j.bbi.2014.04.004

PubMed Abstract | CrossRef Full Text | Google Scholar

Cheng, J. K., Fancher, T. L., Ratanasen, M., Conner, K. R., Duberstein, P. R., Sue, S., et al. (2010). Lifetime suicidal ideation and suicide attempts in Asian Americans. Asian Am. J. Psychol. 1, 18. doi: 10.1037/a0018799

PubMed Abstract | CrossRef Full Text | Google Scholar

Cohen, S. S., Signorello, L. B., Cope, E. L., McLaughlin, J. K., Hargreaves, M. K., Zheng, W., et al. (2012). Obesity and all-cause mortality among black adults and white adults. Am. J. Epidemiol. 176, 431–442. doi: 10.1093/aje/kws032

PubMed Abstract | CrossRef Full Text | Google Scholar

Deaton, A., and Lubotsky, D. (2003). Mortality, inequality and race in American cities and states. Soc. Sci. Med. 56, 1139–1153. doi: 10.1016/S0277-9536(02)00115-6

PubMed Abstract | CrossRef Full Text | Google Scholar

Dowd, J. B., and Zajacova, A. (2007). Does the predictive power of self-rated health for subsequent mortality risk vary by socioeconomic status in the US? Int. J. Epidemiol. 36, 1214–1221. doi: 10.1093/ije/dym214

PubMed Abstract | CrossRef Full Text | Google Scholar

Dressler, W. W., Oths, K. S., and Gravlee, C.C. (2005). Race and ethnicity in public health research: models to explain health disparities. Annu. Rev. Anthropol. 34, 231–252. doi: 10.1146/annurev.anthro.34.081804.120505

CrossRef Full Text | Google Scholar

Drevenstedt, G. (1998). Race and ethnic differences in the effects of religious attendance on subjective health. Rev. Relig. Res. 39, 245–263. doi: 10.2307/3512591

CrossRef Full Text | Google Scholar

Ferraro, K. F., and Kelley-Moore, J. A. (2001). Self-rated health and mortality among black and white adults: examining the dynamic evaluation thesis. J. Gerontol. B. Psychol. Sci. Soc. Sci. 56, S195–205. doi: 10.1093/geronb/56.4.S195

PubMed Abstract | CrossRef Full Text | Google Scholar

Flegal, K. M., Kit, B. K., Orpana, H., and Graubard, B.I. (2013). Association of all-cause mortality with overweight and obesity using standard body mass index categories: a systematic review and meta-analysis. JAMA 309, 71–82. doi: 10.1001/jama.2012.113905

PubMed Abstract | CrossRef Full Text | Google Scholar

Fok, C. C. T., Allen, J., Henry, D., Mohatt, G. V., and People Awakening Team (2012). Multicultural mastery scale for youth: multidimensional assessment of culturally mediated coping strategies. Psychol. Assess. 24, 313–327. doi: 10.1037/a0025505

PubMed Abstract | CrossRef Full Text | Google Scholar

Gariepy, G., Wang, J., Lesage, A. D., and Schmitz, N. (2010). The longitudinal association from obesity to depression: results from the 12-year national population health survey. Obesity 18, 1033–1038. doi: 10.1038/oby.2009.333

PubMed Abstract | CrossRef Full Text | Google Scholar

Gavin, A. R., Rue, T., and Takeuchi, D. (2010). Racial/ethnic differences in the association between obesity and major depressive disorder: findings from the comprehensive psychiatric epidemiology surveys. Public Health Rep. 125, 698.

PubMed Abstract | Google Scholar

González, H. M., Tarraf, W., Whitfield, K. E., and Vega, W. A. (2010). The epidemiology of major depression and ethnicity in the United States. J. Psychol. Res. 44, 1043–1051. doi: 10.1016/j.jpsychires.2010.03.017

PubMed Abstract | CrossRef Full Text | Google Scholar

Hayward, R. D., and Krause, N. (2016). Forms of attrition in a longitudinal study of religion and health in older adults and implications for sample bias. J. Relig. Health. 55, 50–66. doi: 10.1007/s10943-014-9949-5

PubMed Abstract | CrossRef Full Text | Google Scholar

Hu, L., and Bentler, P. M. (1999). Cutoff criteria for fit indexes in covariance structure analysis: conventional criteria versus new alternatives. Struct. Equ. Model. 6, 1–55. doi: 10.1080/10705519909540118

CrossRef Full Text | Google Scholar

Hunt, M. O. (1996). The Individual, society, or both.? A comparison of black, latino, and white beliefs about the causes of poverty. Soc. Forces. 75, 293–332. doi: 10.1093/sf/75.1.293

CrossRef Full Text | Google Scholar

Hunt, M. O., Jackson, P. B., Powell, B., and Steelman, L. C. (2000). Color- blind: the treatment of race and ethnicity in social psychology. Soc. Psychol. Q. 63, 352–364. doi: 10.2307/2695845

CrossRef Full Text | Google Scholar

Jackson, C. L., Szklo, M., Yeh, H. C., Wang, N. Y., Dray-Spira, R., Thorpe, R., et al. (2013). Black-white disparities in overweight and obesity trends by educational attainment in the United States, 1997-2008. J. Obes. 2013:140743. doi: 10.1155/2013/140743

PubMed Abstract | CrossRef Full Text | Google Scholar

Jackson, J. S., and Knight, K. M. (2006). “Race and self-regulatory health behaviors: the role of the stress response and the HPA axis in physical and mental health disparities,” in Social Structures, Aging, and Self-Regulation in the Elderly, eds K. W. Schaie and L. L. Carstensen (New York, NY: Springer), 189–207.

Johnson-Lawrence, V., Griffith, D. M., and Watkins, D. C. (2013). The effects of race, ethnicity and mood/anxiety disorders on the chronic physical health conditions of men from a national sample. Am. J. Men Health 7, 58S–67S. doi: 10.1177/1557988313484960

PubMed Abstract | CrossRef Full Text

Keyes, C. L. (2009). The Black–White paradox in health: flourishing in the face of social inequality and discrimination. J. Pers. 77, 1677–1706. doi: 10.1111/j.1467-6494.2009.00597.x

PubMed Abstract | CrossRef Full Text | Google Scholar

Kline, R. B. (2010). Principles and Practice of Structural Equation Modeling. 3rd Edn. New York, NY: Guilford Press.

Krause, N. (2002). Church-based social support and health in old age: exploring variations by race. J. Gerontol. B. Psychol. Sci. Soc. Sci. 57, S332–S347. doi: 10.1093/geronb/57.6.S332

PubMed Abstract | CrossRef Full Text | Google Scholar

Krause, N. (2006a). Exploring the stress-buffering effects of church-based and secular social support on self-rated health in late life. J. Gerontol. B Psychol. Sci. Soc. Sci. 61, S35–S43. doi: 10.1093/geronb/61.1.S35

PubMed Abstract | CrossRef Full Text | Google Scholar

Krause, N. (2009). Church-based volunteering, providing informal support at church, and self-rated health in late life. J. Aging Health. 21, 63–84. doi: 10.1177/0898264308328638

PubMed Abstract | CrossRef Full Text

Krause, N. (2006b). Religion, Aging, and Health Survey, 2001, 2004 [United States]. ICPSR03255-v2. Ann Arbor, MI: Inter-university Consortium for Political and Social Research.

Google Scholar

Lee, S. J., Moody-Ayers, S. Y., Landefeld, C. S., Walter, L. C., Lindquist, K., Segal, M. R., et al. (2007). The relationship between self-rated health and mortality in older black and white Americans. J. Am. Geriatr. Soc. 55, 1624–1629. doi: 10.1111/j.1532-5415.2007.01360.x

PubMed Abstract | CrossRef Full Text | Google Scholar

Lei, M., and Lomax, R. G. (2005). The effect of varying degrees of nonormality in structural equation modeling. Struct. Equ. Model. 12, 1–27. doi: 10.1207/s15328007sem1201_1

CrossRef Full Text | Google Scholar

Lewis, T. T., Guo, H., Lunos, S., de Leon, C. F. M., Skarupski, K. A., Evans, D. A., et al. (2011). Depressive symptoms and cardiovascular mortality in older black and white adults evidence for a differential association by race. Circ. Cardiovasc. Qual. Outcomes 4, 293–299. doi: 10.1161/CIRCOUTCOMES.110.957548

PubMed Abstract | CrossRef Full Text | Google Scholar

Lincoln, K. D., Chatters, L. M., and Taylor, R. J. (2003). Psychologi cal distress among Black and White Americans: differential effects of social support, negative interaction and personal control. J. Health Soc. Behav. 44, 390. doi: 10.2307/1519786

PubMed Abstract | CrossRef Full Text | Google Scholar

Lindhorst, J., Alexander, N., Blignaut, J., and Rayner, B. (2007). Differences in hypertension between blacks and whites: an overview. Cardiovasc. J. Afr. 18, 241–247.

PubMed Abstract | Google Scholar

Lynch, C. P., Gebregziabher, M., Echols, C., Gilbert, G. E., Zhao, Y., and Egede, L. E. (2010). Racial disparities in all-cause mortality among veterans with type 2 diabetes. J. Gen. Intern. Med. 25, 1051–1056. doi: 10.1007/s11606-010-1405-y

PubMed Abstract | CrossRef Full Text | Google Scholar

MacKinnon, D. P., Krull, J. L., and Lockwood, C.M. (2000). Equivalence of the mediation, confounding and suppression effect. Preven. Sci. 1, 173–181. doi: 10.1023/A:1026595011371

PubMed Abstract | CrossRef Full Text | Google Scholar

McDowell, I. (2010). Measures of self-perceived well-being. J. Psychosom. Res. 69, 69–79. doi: 10.1016/j.jpsychores.2009.07.002

PubMed Abstract | CrossRef Full Text | Google Scholar

Mezuk, B., Abdou, C. M., Hudson, D., Kershaw, K. N., Rafferty, J. A., Lee, H. et al. (2013). “White Box” epidemiology and the social neuroscience of health behaviors: the environmental affordances model. Soc. Ment Health. 3, 79–95. doi: 10.1177/2156869313480892

PubMed Abstract | CrossRef Full Text

Mezuk, B., Rafferty, J. A., Kershaw, K. N., Hudson, D., Abdou, C. M., Lee, H., et al. (2010). Reconsidering the role of social disadvantage in physical and mental health: stressful life events, health behaviors, race, and depression. Am. J. Epidemiol. 172, 1238–1249. doi: 10.1093/aje/kwq283

PubMed Abstract | CrossRef Full Text | Google Scholar

Mirowsky, J. (1995). Age and the sense of control. Soc. Psychol. Quart. 58, 31–43. doi: 10.2307/2787141

PubMed Abstract | CrossRef Full Text | Google Scholar

Mirowsky, J. (1997). Age, subjective life expectancy, and the sense of control: the horizon hypothesis. J. Gerontol. 52B, S125–S134. doi: 10.1093/geronb/52B.3.S125

PubMed Abstract | CrossRef Full Text | Google Scholar

Moazen-Zadeh, E., and Assari, S. (2016). Depressive symptoms predict major depressive disorder after 15 years among whites but not blacks. Front. Public Health 4:13. doi: 10.3389/fpubh.2016.00013

PubMed Abstract | CrossRef Full Text | Google Scholar

Mouzon, D. M. (2013). Can Family Relationships Explain the Race Paradox in Mental Health? J. Marriage Family 75, 470–485. doi: 10.1111/jomf.12006

CrossRef Full Text | Google Scholar

Mouzon, D. M. (2014). Relationships of choice: can friendships or fictive kin explain the race paradox in mental health? Soc. Sci. Res. 44, 32–43. doi: 10.1016/j.ssresearch.2013.10.007

PubMed Abstract | CrossRef Full Text | Google Scholar

Owen, W.F. Jr. (1996). Racial differences in incidence, outcome, and quality of life for African-Americans on hemodialysis. Blood Purif. 14, 278–285. doi: 10.1159/000170274

PubMed Abstract | CrossRef Full Text | Google Scholar

Patel, A. V., Hildebrand, J. S., and Gapstur, S. M. (2014). Body mass index and all-cause mortality in a large prospective cohort of white and black us Adults. PLoS ONE 9:e109153. doi: 10.1371/journal.pone.0109153

PubMed Abstract | CrossRef Full Text | Google Scholar

Pearlin, L. I., and Pioli, M. (2003). “Personal control: Some conceptual turf and future directions,” in Personal Control in Social and Life Course Contexts, eds S. Zarit, L. I. Pearlin, and K. Schaie (New York, NY: Springer), 1–19.

Radloff, L. S. (1977). The CES-D scale: a self-report depression scale for research in the general population. Appl. Psychol. Measure. 1, 385–401. doi: 10.1177/014662167700100306

CrossRef Full Text

Rodin, J. (1986). Aging and health: effects of the sense of control. Science 233, 1271–1276. doi: 10.1126/science.3749877

PubMed Abstract | CrossRef Full Text | Google Scholar

Sachs-Ericsson, N., Burns, A. B., Gordon, K. H., Eckel, L. A., Wonderlich, S. A., Crosby, R. D., et al. (2007). Body mass index and depressive symptoms in older adults: the moderating roles of race, sex, and socioeconomic status. Am. J. Geriatr. Psychiatry 15, 815–825. doi: 10.1097/JGP.0b013e3180a725d6

PubMed Abstract | CrossRef Full Text | Google Scholar

Signorello, L. B., Schlundt, D. G., Cohen, S. S., Steinwandel, M. D., Buchowski, M. S., McLaughlin, J. K., et al. (2007). Comparing diabetes prevalence between African Americans and Whites of similar socioeconomic status. Am. J. Public Health. 97, 2260–2267. doi: 10.2105/AJPH.2006.094482

PubMed Abstract | CrossRef Full Text | Google Scholar

Skarupski, K. A., Fitchett, G., Evans, D. A., and Mendes de Leon, C. F. (2013). Race differences in the association of spiritual experiences and life satisfaction in older age. Aging Ment Health. 17, 888–895. doi: 10.1080/13607863.2013.793285

PubMed Abstract | CrossRef Full Text | Google Scholar

Stewart, J. C. (2016). One effect size does not fit All-Is the depression-inflammationlink missing in racial/ethnic minority individuals? JAMA Psychiatry 73, 301–302. doi: 10.1001/jamapsychiatry.2015.3205

PubMed Abstract | CrossRef Full Text | Google Scholar

Vrany, E. A., Berntson, J. M., Khambaty, T., and Stewart, J. C. (2016). Depressive symptomsclusters and insulin resistance: race/ethnicity as a moderator in2005-2010 NHANES Data. Ann. Behav. Med. 50, 1–11. doi: 10.1007/s12160-015-9725-0

PubMed Abstract | CrossRef Full Text | Google Scholar

Watkins, D. C., Assari, S., and Johnson-Lawrence, V. (2015). Race and ethnic group differences in comorbid major depressive disorder, generalized anxiety disorder, and chronic medical conditions. J. Racial Ethn. Health Disparit. 2, 385–394. doi: 10.1007/s40615-015-0085-z

PubMed Abstract | CrossRef Full Text | Google Scholar

Wheaton, B. (1983). Stress, personal coping resources, and psychiatric symptoms: an investigation of interactive models. J. Health Soc. Behav. 24, 208–229. doi: 10.2307/2136572

PubMed Abstract | CrossRef Full Text | Google Scholar

Williams, D. R., González, H. M., Neighbors, H., Nesse, R., Abelson, J. M., Sweetman, J., et al. (2007). Prevalence and distribution of major depressive disorder in African Americans, Caribbean blacks, and non-hispanic whites: results from the national survey of American life. Arch Gen Psychiatr. 64, 305–315. doi: 10.1001/archpsyc.64.3.305

PubMed Abstract | CrossRef Full Text | Google Scholar

Zayas, L. H., Cunningham, M., McKee, M. D., and Jankowski, K. R. (2002). Depression and negative life events among pregnant African-American and hispanic women. Women's Health Iss. 12, 16–22. doi: 10.1016/S1049-3867(01)00138-4

PubMed Abstract | CrossRef Full Text | Google Scholar

Zhang, W., O'Brien, N., Forrest, J. I., Salters, K. A., Patterson, T. L., Montaner, J. S., et al. (2012). Validating a shortened depression scale (10 item CES-D) among HIV-positive people in British Columbia, Canada. PLoS ONE 7:e40793. doi: 10.1371/journal.pone.0040793

PubMed Abstract | CrossRef Full Text | Google Scholar

Keywords: population groups, ethnic groups, african americans, depressive symptoms, depression, mastery, self-efficacy

Citation: Assari S and Lankarani MM (2017) Reciprocal Associations between Depressive Symptoms and Mastery among Older Adults; Black-White Differences. Front. Aging Neurosci. 8:279. doi: 10.3389/fnagi.2016.00279

Received: 31 May 2016; Accepted: 07 November 2016;
Published: 05 January 2017.

Edited by:

Lia Fernandes, University of Porto, Portugal

Reviewed by:

Neha Sehgal, Wisconsin Institute for Discovery, USA
Umesh Gangishetti, Emory University, USA

Copyright © 2017 Assari and Lankarani. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Shervin Assari, YXNzYXJpQHVtaWNoLmVkdQ==

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