title: Effectiveness of colonoscopy in preventing colorectal cancer.
authors.forename: D B
authors.initials: DB
authors.lastname: Nelson
mesh_terms: D003111:Colonic Polyps / Q000601:surgery; D003113:Colonoscopy / Q000592:standards*; D015179:Colorectal Neoplasms / Q000517:prevention & control*; D006801:Humans