Review

Impact of Patient Selection in Various Study Designs: Identifying Potential Bias in Clinical Results

Many different study designs are used to address different types of clinical questions. The two broad categories are the experimental study, which is the randomized controlled trial, and observational studies, which includes all of the other basic study designs (cohort [prospective and retrospective] studies, case-control [etiologic] studies, cross-sectional [prevalence] studies,…