title: Letter re: A systematic approach to subgroup analysis in a smoking cessation trial.
authors.affiliation: a Department of Medical Biostatistics , University of Vermont , Burlington , VT , USA.
authors.forename: Peter
authors.initials: P
authors.lastname: Callas
mesh_terms: D003627:Data Interpretation, Statistical; D005260:Female; D006801:Humans; D008297:Male; D016032:Randomized Controlled Trials as Topic / Q000379:methods*; D016540:Smoking Cessation; D061485:Tobacco Use Cessation Devices