Use of an oral-anal string as a guideline for colonoscopy.
D003106:Colon; D003110:Colonic Neoplasms / Q000175:diagnosis / Q000601:surgery; D019723:Endoscopes; D005336:Fiber Optic Technology; D006801:Humans; D007417:Intestinal Polyps / Q000175:diagnosis / Q000601:surgery; D008722:Methods; D013523:Surgical Equipment