Update on gastrointestinal endoscopy. 3. Colonoscopy and sigmoidoscopy.
D003108:Colonic Diseases / Q000175:diagnosis*; D020685:Colonoscopes; D003113:Colonoscopy / Q000379:methods*; D006801:Humans; D020694:Sigmoidoscopes; D012812:Sigmoidoscopy / Q000379:methods*