AUTHOR=Jung Su Yon TITLE=Challenges in Epidemiological and Statistical Evaluations of Effect Modifiers and Confounders JOURNAL=Frontiers in Public Health VOLUME=2 YEAR=2014 URL=https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2014.00277 DOI=10.3389/fpubh.2014.00277 ISSN=2296-2565