[The difference between volunteer and non-volunteer control groups in field trials in medicine (author's transl)].
D000293:Adolescent; D000328:Adult; D002986:Clinical Trials as Topic / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012959:Socioeconomic Factors
Razlika dobrovoljaca i nedobrovoljaca kao kontrolne skupine u terenskim istrazivanjima u medicini.