title: A lesson in sigmoidoscopy.
authors.forename: G
authors.initials: G
authors.lastname: Brock
authors.forename: V L
authors.initials: VL
authors.lastname: Gurekas
mesh_terms: D002170:Canada; D015179:Colorectal Neoplasms / Q000517:prevention & control*; D006801:Humans; D008403:Mass Screening / Q000379:methods*; D010821:Physicians, Family / Q000193:education*; D012812:Sigmoidoscopy