title: Colonoscopy or flexible proctosigmoidoscopy.
authors: B M
authors: BM
authors: Stephenson
authors: P J
authors: PJ
authors: Finan
mesh_terms: D003113:Colonoscopy; D015179:Colorectal Neoplasms / Q000517:prevention & control*; D006801:Humans; D009780:Occult Blood; D010375:Pedigree; D011351:Proctoscopy; D012307:Risk Factors; D012812:Sigmoidoscopy