title: Response.
authors.affiliation: aDepartment of Epidemiology and Biostatistics, College of Public Health, University of South Florida, Tampa, FL, USA.
authors.forename: Henian
authors.initials: H
authors.lastname: Chen
authors.forename: Nanhua
authors.initials: N
authors.lastname: Zhang
authors.forename: Xiaosun
authors.initials: X
authors.lastname: Lu
authors.forename: Sophie
authors.initials: S
authors.lastname: Chen
mesh_terms: D002986:Clinical Trials as Topic / Q000706:statistics & numerical data*; D006801:Humans; D018401:Sample Size