title: Role of colonoscopy in unexplained lower gastrointestinal bleeding.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003092:Colitis / Q000175:diagnosis; D003113:Colonoscopy; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D014456:Ulcer / Q000175:diagnosis