The President and the power of the colonoscope.
D003106:Colon / Q000000981:diagnostic imaging; D003111:Colonic Polyps / Q000175:diagnosis / Q000601:surgery; D020685:Colonoscopes; D003113:Colonoscopy / Q000379:methods; D003365:Costs and Cost Analysis; D006801:Humans; D011859:Radiography