title: Screening sigmoidoscopy-- how often and how good?
authors.forename: Robert H
authors.initials: RH
authors.lastname: Fletcher
mesh_terms: D000236:Adenoma / Q000175:diagnosis*; D000328:Adult; D003110:Colonic Neoplasms / Q000175:diagnosis*; D006801:Humans; D012812:Sigmoidoscopy; D013997:Time Factors