title: Screening sigmoidoscopy for colorectal cancer.
authors.forename: B
authors.initials: B
authors.lastname: Levin
mesh_terms: D000236:Adenoma / Q000150:complications*; D003110:Colonic Neoplasms / Q000150:complications*; D015179:Colorectal Neoplasms / Q000175:diagnosis* / Q000401:mortality; D006801:Humans; D008875:Middle Aged; D012306:Risk; D012812:Sigmoidoscopy; D013997:Time Factors