title: Flexible sigmoidoscopy versus colonoscopy--when to use which instrument.
mesh_terms: D003108:Colonic Diseases / Q000175:diagnosis; D003113:Colonoscopy; D005336:Fiber Optic Technology / Q000295:instrumentation; D006801:Humans; D012002:Rectal Diseases / Q000175:diagnosis; D012812:Sigmoidoscopy