Xiongliang Peng
Kun Yu- Renmin University of China, Beijing, China
Previous studies only considered the impact of personal or environmental factors on intensive smartphone use separately, while largely ignoring the impact of person-environment (P-E) fit on it. Drawing on the P-E fit theory, we proposed that perceived overqualification (POQ), an indicator of person-job misfit, positively affects intensive smartphone use via job boredom, and affective commitment moderates this indirect effect. We examined our hypotheses using four-wave time-lag data of 450 workers from 62 teams. The results revealed that POQ raised job boredom of an individual and thus increased their intensive smartphone use. In addition, when the affective commitment was high, the indirect effect from POQ to intensive smartphone use via job boredom was weaker. The implications, limitations, and future directions of this research were discussed.
Introduction
Smartphones, which can be used for making phone calls, bring many conveniences to people and are already in widespread use (Spagnoli et al., 2019; Busch and McCarthy, 2021). However, intensive use of smartphones may be problematic and trigger adverse consequences, such as depression (Harwood et al., 2014; Kliestik et al., 2020; Lǎzǎroiu et al., 2020), anxiety (Hartanto and Yang, 2016; Green et al., 2020; Taylor et al., 2020), and wellbeing (David et al., 2018). Considering the potential negative consequences of intensive smartphone use, increasing attention has been paid to its formation mechanism, which could provide substantive suggestions on how to avoid those adverse outcomes (Busch and McCarthy, 2021). Previous literature on the antecedents of intensive smartphone use mainly includes personal characteristics, such as self-control (Berger et al., 2018; Servidio, 2019), emotional instability (Roberts et al., 2015), and self-efficacy (Chiu, 2014), and environmental factors, such as dependence on the smartphone for work (Li and Lin, 2018), conformity (Chen et al., 2017), and perceived stress (Liu et al., 2018).
However, previous studies either considered the impact of personal or environmental factors on intensive smartphone use separately, while ignoring the possible interactions between personal and environmental factors, such as person-environment (P-E) fit. The fit between person and environment brings individuals pleasant emotions and positive motivations, which, in turn, leads to a series of positive consequences, such as job self-efficacy (Yu and Davis, 2016), creativity (Luksyte and Spitzmueller, 2016), and voice behavior (Erdogan et al., 2020). The P-E fit theory posits that there are five types of P-E fit, in which person-job fit is particularly important for individuals, especially in the workplace (Kristof-Brown et al., 2005; Jansen and Kristof-Brown, 2006; van Vianen, 2018). For instance, perceived overqualification (POQ), a typical type of person-job misfit in organizations (Erdogan et al., 2020) and a global trending phenomenon (Hu et al., 2015; Li et al., 2021; Zhang et al., 2021a), was proved from different theoretical perspectives that could rise many negative consequences in the workplace (Feldman, 1996; Harari et al., 2017), such as more counterproductive behavior (Liu et al., 2015; Schreurs et al., 2020), high turnover (Wu and Chi, 2020), less creative performance (Zhang et al., 2021b), and less proactive behavior (Luksyte et al., 2020). Furthermore, recent research has found that POQ leads to more cyberloafing in the organization (Cheng et al., 2020). Compared with using computers to cyberloafing on the Internet, due to the convenience of the smartphone, more and more employees deliberately use smartphones intensively during working hours (Busch and McCarthy, 2021). Unfortunately, the investigation on whether POQ has an association with intensive smartphone use, and if so, how and when, is largely absent from the literature.
The P-E fit theory states that when individuals perceive misfits between a person and the job, they may experience a type of negative emotion called job boredom (Edwards and Van Harrison, 1993; Kim et al., 2021). Job boredom is defined as an unpleasant and deactivated emotion, which is characterized by low arousal and dissatisfaction caused by a lack of a stimulating work environment (Reijseger et al., 2013). Given that boredom is an emotional response to a less stimulating work environment, it is usually experienced by overqualified employees (Liu and Wang, 2012; Sánchez-Cardona et al., 2020; Kim et al., 2021). Furthermore, the P-E fit theory also suggests that individuals could take some measures to cope with the negative emotions caused by person-job misfits (Kristof-Brown et al., 2005; van Vianen, 2018). For instance, empirical research has shown that job boredom could promote individuals to use smartphones frequently (Smetaniuk, 2014; Fullwood et al., 2017). Therefore, we proposed that job boredom may be a critical mechanism to explain the relationship between the POQ of employees and their intensive use of smartphones.
Additionally, the P-E fit theory proposes that different types of fit could complement or strengthen each other (Kristof-Brown et al., 2005; van Vianen, 2018). Therefore, the relationship between person-job misfit (POQ) and job boredom may be affected by other types of fit. For instance, the affective commitment of employees to the organization, as a typical person-organization fit, may alleviate the adverse impact of the person-job misfit (van Vianen, 2018). In fact, previous empirical studies have provided preliminary evidence for the mitigating effect of person-organization fit on other misfits (Erdogan et al., 2020; Zhang et al., 2021b).
Therefore, the purpose of this research was to investigate the relationship between POQ and intensive smartphone use, its underlying mechanism, and the boundary conditions. According to the P-E fit theory (Kristof-Brown et al., 2005; Edwards, 2008), we investigated the influence of POQ on intensive smartphone use through the mediation of job boredom. Moreover, in response to the impact of different fit interactions on employees (Oh et al., 2014; Harold et al., 2016), we assumed that affective commitment alleviates the positive impact of POQ on job boredom. Finally, we proposed that affective commitment buffers the indirect effect of POQ on intensive smartphone use via job boredom. Our moderated mediation model is depicted in Figure 1.
Figure 1. Proposed research model.
Two contributions of this study to the literature are worth noting. First, drawing on the P-E fit theory (Kristof-Brown et al., 2005; Edwards, 2008; van Vianen, 2018), this study enriches our understanding of the antecedents of intensive smartphone use from an interactive perspective of person and environment and helps us better understand how POQ leads to intensive smartphone use through an emotional route. Second, by examining the interactive effect of affective commitment, an indicator of person-organization fit, and POQ on job boredom and intensive smartphone use, this study addresses the issue of inconsistent conclusions in intensive smartphone use literature due to the lack of exploration of boundary conditions (Busch and McCarthy, 2021) and well answers the scholastic call for the interactions between different fitting types (Kristof-Brown et al., 2005; Jansen and Kristof-Brown, 2006).
Hypothesis Development
The Mediating Role of Job Boredom
The P-E fit theory offers a solid theoretical foundation for studying the impact of POQ on intensive smartphone use. According to the P-E fit theory (Edwards, 2008; van Vianen, 2018), when individuals are compatible (incompatible) with one or more characteristics of the work environment, fit (misfit) will occur and thus produce positive (negative) results for the individuals and organizations. The characteristic of the work environment mainly includes job, organization, vocation, team, and supervisor (Jansen and Kristof-Brown, 2006). Therefore, in terms of content, the P-E fit includes five types (van Vianen, 2018). Among them, person-job fit means that individual abilities and job demands and supplies are supposed to be fit appropriately (Edwards, 2008; Rodrigues et al., 2020). Based on this definition, POQ, which refers to the perception of individuals of their qualifications, such as knowledge, skills, abilities (KSAs), work experience, and education beyond the job requirements (Erdogan and Bauer, 2009; Chen et al., 2021; Zhang et al., 2021c), is a typical person-job misfit (Liu and Wang, 2012). Previous studies have found that POQ could bring several adverse consequences to employees (Harari et al., 2017), such as more cyberloafing (Cheng et al., 2020), high turnover (Wu and Chi, 2020), and less proactive behavior (Luksyte et al., 2020).
However, although the effect of job boredom, an unpleasant state commonly links to insufficient stimulation in the work environment (Mikulas and Vodanovich, 1993; Reijseger et al., 2013), on intensive smartphone use was well documented in the literature (Elhai et al., 2018; Wang et al., 2020), and there are relatively few studies on the association between POQ or other forms of person-job misfit and job boredom (Harju and Hakanen, 2016; Sánchez-Cardona et al., 2020). For the following reasons, we proposed that POQ could affect intensive smartphone use through job boredom.
First, the KSAs of overqualified employees far go beyond the job requirements, which indicates that the stimulation provided by the job is not enough to attract the interests of employees. The misfit between person and job will result in the boredom of employees (Reijseger et al., 2013; Harju and Hakanen, 2016). In fact, prior studies have provided preliminary evidence for the effect of POQ on job boredom (Harju and Hakanen, 2016; Sánchez-Cardona et al., 2020). Second, when individuals feel bored at work, they usually try to deal with it by distracting themselves (e.g., intensive smartphone use) rather than focusing on work tasks (Reijseger et al., 2013). As mentioned above, previous literature has given sufficient evidence on the effect of job boredom on intensive smartphone use (Elhai et al., 2018; Wang et al., 2020). In summary, overqualified individuals are likely to experience job boredom due to their qualifications exceeding the job requirements, and they will more likely to use the smartphone intensively to eliminate the discomfort caused by this misfit and boredom. Accordingly, we proposed the following hypothesis:
H1: Job boredom mediates the relationship between POQ and intensive smartphone use.
The Moderating Role of Affective Commitment
According to the P-E fit theory (Edwards, 2008; van Vianen, 2018), among the five types of P-E fit, the person-organization fit is the most studied one (Kristof-Brown et al., 2005; Jansen and Kristof-Brown, 2006) and mainly refers to an individual identifying with the value of the organization and having a sense of dependence on the organization (van Vianen, 2018). Based on this definition, affective commitment, as the core of organizational commitment, means identification of an individual with, participation in, emotional attachment to an organization and willingness to be a member of the organization (Meyer et al., 1993; Lin, 2010; Taylor et al., 2012; Vandenberghe et al., 2017), can be categorized as a type of person-organization fit (Kristof-Brown et al., 2005; Jansen and Kristof-Brown, 2006).
Based on the P-E fit theory (Edwards, 2008; van Vianen, 2018), the impact of person-job fit on the outcomes is most likely to be moderated by person-organization fit (Kristof-Brown et al., 2005; Erdogan et al., 2020). Along with this logic, the consequences of person-job misfit on job boredom and intensive smartphone use may be alleviated by person-organization fit too. Thus, affective commitment, as a type of person-organization fit, is likely to alleviate the job boredom caused by POQ (person-job misfit). For instance, overqualified individuals with a high affective commitment have a strong emotional attachment to the organization (Meyer et al., 1993). They may reduce the job boredom caused by the person-job misfit by shifting their attention to the organization (Harju and Hakanen, 2016). Therefore, we proposed that affective commitment could alleviate the job boredom caused by POQ and also weaken the mediation path from POQ to intensive smartphone use via job boredom. To sum up, we assumed the following hypotheses:
H2: Affective commitment moderates the positive impact of POQ on job boredom. Specifically, the positive effect is weaker when affective commitment is higher.
H3: Affective commitment moderates the mediating effect of job boredom in the relationship between POQ and intensive smartphone use. Specifically, the mediating effect is weaker when affective commitment is higher.
Materials and Methods
Sample and Procedures
We surveyed data from a large state-owned enterprise in China, which is part of a larger data collection. The enterprise was mainly responsible for maritime traffic and transportation, so all employees were men and belonged to several teams. After contacting the top management of the enterprise, they expressed great willingness to cooperate and appointed a human resources staff to be responsible for the research. Before the questionnaire survey, we told team leaders and employees that the survey was only for academic research and there was no reward. They could freely decide whether to participate in the survey or not. Finally, with the help of the staff in charge, we set up a WeChat (an instant messaging app) group for each team willing to participate in the research and distributed questionnaires via those online groups.
All variables were self-reported, which might lead to common method bias (CMB; Podsakoff et al., 2003). For the sake of reducing the impact of CMB on the research results, data collection was carried out in four stages, each with an interval of 2 weeks. Specifically, POQ, age, job tenure, and education were measured at Time 1; affective commitment was measured at Time 2; job boredom was measured at Time 3; and intensive smartphone use was measured at Time 4. All participating employees were full-time men, and we ensured them that their responses were anonymous and confidential.
When we initially contacted all 530 employees (67 teams) of the organization to ask for participation, we got an 89.8% response rate. Considering the sample fitting, only the responses of all employees collected from the four waves of data were included in the final analysis. The final sample was 450 employees (62 teams), and the response rate was 84.9%. The average age of all participants was 35.36 years (SD = 7.57), and the average tenure was 13.00. Moreover, 47.1% of the participants had a bachelor’s degree or above.
Measures
According to the translation-back-translation standard, we translated all the English items into Chinese (Brislin, 1980). All the items described below were surveyed with the seven-point Likert scale unless specifically noted.
Perceived Overqualification
We measured POQ with nine items using a scale adapted from Maynard et al. (2006), which was commonly used in the POQ literature (Erdogan et al., 2020; Wu and Chi, 2020). A sample item was “I have job skills that are not required for this job” (α = 0.82).
Affective Commitment
We measured affective commitment using a six-item scale developed by Meyer et al. (1993). An example of the item was “This organization has a great deal of personal meaning for me” (α = 0.77).
Job Boredom
We measured job boredom using a six-item scale (Reijseger et al., 2013). A sample item was “At my work, there is not so much to do” (α = 0.92).
Intensive Smartphone Use
A three-item scale developed by Spagnoli et al. (2019) was used to gauge intensive smartphone use. A sample item was “At my work, there is not so much to do” (α = 0.86).
Control Variables
According to the literature on POQ and smartphone use, we controlled age, education level, and job tenure of employees (Kwon et al., 2016; Zhang et al., 2016; Barnes et al., 2019; Busch and McCarthy, 2021).
Results
Preliminary Analyses
The descriptive statistics and correlations between variables are exhibited in Table 1. As shown in Table 1, POQ was positively related to job boredom (r = 0.21, p < 0.01) and intensive smartphone use (r = 0.13, p < 0.01). Job boredom was positively related to intensive smartphone use (r = 0.17, p < 0.01).
Table 1. Descriptive statistics and correlations between variables.
Since all variables were self-reported by employees (i.e., POQ, affective commitment, job boredom, and intensive smartphone use), confirmatory factor analyses (CFA) were performed using Mplus 8.3 to test the discrimination validity of variables. Considering the number of observed indicators, we adopted the random packing method to pack the items, which avoids non-convergence issues and improves the reliability of indicators (Hall et al., 1999; Nasser and Wisenbaker, 2003). POQ, affective commitment, and job boredom were all randomly grouped into three items. As demonstrated in Table 2, the hypothesized four-factor model fitted better to data [χ2(48) = 83.05, p < 0.001, CFI = 0.99, TLI = 0.98, RMSEA = 0.04, SRMR = 0.04] than alternative models. The results of CFA demonstrated that our variables were well differentiated.
Table 2. The results of confirmatory factor analysis (N = 450).
Analytical Strategy
Considering the nested nature of the data, we conducted a one-way random ANOVA of the outcome variable (intensive smartphone use) to determine whether the multilevel analysis is required. The results revealed that variance in intensive smartphone use was significant [F(61, 388) = 1.59, p < 0.01], and the intra-class correlation (ICC 1) was 0.08, which manifested a clear nest structure. Therefore, we performed multilevel analysis using Mplus 8.3 to estimate the research model.
First, we tested the simple mediation model (Hypothesis 1) by specifying intensive smartphone use as the dependent variable. When testing the mediating effect, we used the original data directly to test the main effect of Level 1 predictors, which was considered reasonable (Hofmann, 1997). Second, in testing the moderation model (Hypotheses 2 and 3), as POQ and affective commitment were both at Level 1, they were group-mean centered to analyze the moderation effect (Enders and Tofighi, 2007). The moderation effect was further elaborated through simple slope analyses (Aiken and West, 1991). To test the moderated mediation effect (Hypothesis 3), we calculated the indirect effect of POQ on intensive smartphone use through job boredom when the affective commitment was above and below 1 SD, respectively (Edwards and Lambert, 2007).
Hypothesis Testing
For the test of Hypothesis 1, we analyzed the simple mediation model, and all results are shown in Table 3. POQ was significantly and positively associated with job boredom (B = 0.24, p < 0.01), which in turns lead to more intensive smartphone use (B = 0.12, p < 0.01). The indirect impact of POQ on intensive smartphone use via job boredom was 0.03, 95% CI = [0.01, 0.05]. Thus, Hypothesis 1 was supported.
Table 3. Results for the moderated mediation model.
Hypothesis 2 proposed that affective commitment weakened the positive impact of POQ on job boredom. The interaction effect (Model 2 in Table 3) of POQ and affective commitment on job boredom were negative (B = –0.16, p < 0.01). Moreover, we plotted the moderating effect of affective commitment in Figure 2 (Aiken and West, 1991). Figure 2 displays that POQ had a weaker positive effect on job boredom when affective commitment was high (+ 1 SD; B = –0.03, p = 0.30) than low (–1 SD; B = 0.27, p < 0.01), thus supporting Hypothesis 2.
Figure 2. Moderating effect of affective commitment on the relationship between perceived overqualification (POQ) and job boredom.
Hypothesis 3 posited the moderated mediation effect, in which the indirect effect of POQ on intensive smartphone use via job boredom was moderated by affective commitment. As presented in Table 4, compared with low affective commitment (indirect effect = 0.04, p < 0.01), when affective commitment was high (indirect effect = 0.00, p = 0.30), the indirect effect of POQ on intensive smartphone use was weaker. The difference of indirect effect between high and low affective commitment was –0.04, 95% CI = [–0.09, 0.00]. Thus, Hypothesis 3 was supported.
Table 4. Conditional indirect effect as a function of affective commitment.
Discussion
We used the P-E fit theory (Kristof-Brown et al., 2005; Edwards, 2008; van Vianen, 2018) to investigate the mechanism and boundary conditions of the relationship between POQ and intensive smartphone use in this study. Specifically, we collected four-wave time-lag data of 450 employees from 62 teams to test whether job boredom mediates the relationship between POQ and intensive smartphone use, and how the affective commitment moderates the indirect relationship. Consistent with the P-E fit theory (Kristof-Brown et al., 2005; Edwards, 2008; van Vianen, 2018), we found that job boredom mediates the relationship between POQ and intensive smartphone use. Moreover, affective commitment buffered the mediating effect of job boredom in the relationship between POQ and intensive smartphone use.
Theoretical Implications
This research contributes to the literature in the following two ways. First, we investigated the formation process of intensive use from a novel lens. A recent review (Busch and McCarthy, 2021) pointed out that previous studies on the antecedents of intensive smartphone use either focused on personal factors or environmental factors separately, ignoring the possible critical role of the P-E fit. The investigation was not comprehensive because individual behaviors are also affected by continuous interactions between individuals and environments (van Vianen, 2018). In addition, previous literature on the antecedents of intensive smartphone use has not conducted in-depth research on the formation mechanism of why individuals use smartphones frequently (Horwood and Anglim, 2019; Porter et al., 2020; Scott et al., 2020). Based on the P-E fit theory (Kristof-Brown et al., 2005; Edwards, 2008; van Vianen, 2018), the examination of POQ and the effect of job boredom on intensive smartphone use enrich the research on the antecedents and formation mechanism of intensive smartphone use from a more interactive perspective.
Second, we further contributed to the literature by answering when POQ would have an impact on job boredom and intensive smartphone use. Previous studies on the antecedents of intensive smartphone use have not reached a consistent conclusion (Busch and McCarthy, 2021), which may be due to the lack of exploration of boundary conditions (Servidio, 2019; Taylor et al., 2020; Wang et al., 2020). Research has shown that job crafting or meaningful work could alleviate the impact of POQ on job boredom (Sánchez-Cardona et al., 2020) while ignoring the impact of the interaction of different fits/misfits on employees, which is urgently called for an investigation (Kristof-Brown et al., 2002; Jansen and Kristof-Brown, 2006). Based on the P-E fit theory (Kristof-Brown et al., 2005; van Vianen, 2018), this study explores the complementary effect of person-organization fit (affective commitment) and person-job misfit (POQ) on job boredom and intensive smartphone use, which also enriches our understanding of the joint effect among different (mis) fits within the P-E fit framework.
Practical Implications
This study also has two important practical implications. First, considering the harm of the intensive use of smartphones, some scholars put forward suggestions to prohibit the use of smartphones in the workplace (Busch and McCarthy, 2021). This research reveals that overqualified individuals frequently use smartphones due to job boredom. Therefore, reducing the boredom of employees or even preventing them from being bored is the key to the problem of the overuse of smartphones. Otherwise, even if the use of smartphones is prohibited, employees will kill boredom in other ways (e.g., cyberloafing, doodling, and fidgeting). Given overqualified individuals are more likely to experience job boredom (Kim et al., 2021), organizations should select qualified employees rather than overqualified ones. For existing overqualified employees, the organization should assign them more challenging tasks (Kim et al., 2021) to improve their person-job fit and to decrease their job boredom. In addition, previous studies have shown that having more job resources could reduce the job boredom of employees (Harju et al., 2016, 2018; Toscanelli et al., 2021). For instance, giving job autonomy for overqualified employees (Toscanelli et al., 2021) or spaces for job crafting (Harju et al., 2016) could provide them with needed job resources (van Hooff and van Hooft, 2014) and reduce their job boredom, and, finally, lower their frequency of using smartphones.
Second, this study shows that affective commitment reduced the intensive use of the smartphone for overqualified employees. Thus, for those overqualified employees to lower their job boredom and intensive use of smartphones, the organization should carry out strategies to improve their affective commitment, such as providing organizational support (Stinglhamber and Vandenberghe, 2003), reducing their work-family conflict (Wayne et al., 2013), and supervisory mentoring (Lapointe and Vandenberghe, 2017).
Limitations and Future Directions
Although our research has several contributions, there are still some deficiencies that need to be further improved in the future. First, although we identified the mechanism by which POQ affects intensive smartphone use from the perspective of the P-E fit, other mechanisms may also exist (e.g., self-efficacy and relative deprivation), which require further examinations. Meanwhile, this study regards affective commitment as a situational factor to alleviate job boredom of employees. However, we did not further explore the mechanism by which affective commitment affects job boredom. Previous studies have shown that employees with high affective commitment could carry out more job crafting (Naeem et al., 2021), which, in turn, reduces job boredom (Harju et al., 2016). Future research could further explore the mediating mechanism between affective commitment and job boredom. Moreover, as we conceptualized affective commitment as a person-organization fit in this research, future studies could also consider the impact of the other three types of fit on the effect of POQ (person-job misfit).
Second, despite that our data were nested, we analyzed the data at the individual level while controlling the variation at the team level. It is worth noting that the use of smartphones may also be related to the characteristics of the work team or even the organization. Future research could perform multilevel analysis using nested data to explore the impact of the team or organizational factors on intensive smartphone use. Moreover, we collected data over multiple periods, but reverse causality is still possible. Thus, future research is supposed to apply a longitudinal design or experimental design to get a stronger causal relationship between POQ and intensive smartphone use.
Conclusion
In brief, we identified a critical insufficiency in the area of intensive smartphone use, which is the lack of a P-E fit perspective in the antecedent investigation. Therefore, this research addresses the above issue and draws on the P-E fit theory (Edwards, 2008; van Vianen, 2018) to investigate the mechanism and boundary conditions in the relationship between POQ, a typical person-job fit, and intensive smartphone use. The findings demonstrated that job boredom mediates the relationship between POQ and intensive smartphone use, and the mediation path was weaker for employees with higher affective commitment. The findings of this study contribute to a more comprehensive understanding of the emergence of intensive smartphone use from a P-E fit perspective.
Data Availability Statement
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.
Ethics Statement
The studies involving human participants were reviewed and approved by IRB of the School of Labor and Human Resources, Renmin University of China. The patients/participants provided their written informed consent to participate in this study.
Author Contributions
XP: conceptualization, data collection and analysis, and drafting. KY: conceptualization, drafting, and revising the manuscript. KZ, HX, and JP: drafting and validating the final submitted version. All authors contributed to the article and approved the submitted version.
Funding
This article was funded by the National Natural Science Foundation of China (No. 72171227).
Conflict of Interest
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.
Publisher’s Note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
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Keywords: intensive smartphone use, perceived overqualification, affective commitment, job boredom, person-environment (PE) fit theory
Citation: Peng X, Yu K, Zhang K, Xue H and Peng J (2022) Perceived Overqualification and Intensive Smartphone Use: A Moderated Mediation Model. Front. Psychol. 13:794913. doi: 10.3389/fpsyg.2022.794913
Received: 14 October 2021; Accepted: 17 January 2022;
Published: 25 February 2022.
Edited by:
George Lazaroiu, Spiru Haret University, RomaniaReviewed by:
Aurel Pera, University of Craiova, RomaniaLaura Guerrero, University of Houston–Clear Lake, United States
Copyright © 2022 Peng, Yu, Zhang, Xue and Peng. 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) and the copyright owner(s) 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: Kun Yu, yuk@ruc.edu.cn