title: What are the appropriate controls for a colonoscopic screening program?
authors.forename: L
authors.initials: L
authors.lastname: Herrera
authors.forename: N J
authors.initials: NJ
authors.lastname: Petrelli
mesh_terms: D000328:Adult; D000368:Aged; D003110:Colonic Neoplasms / Q000453:epidemiology / Q000235:genetics*; D003113:Colonoscopy; D006801:Humans; D008403:Mass Screening; D008875:Middle Aged; D012107:Research Design / Q000592:standards*