title: Limitations of combined flexible sigmoidoscopy and double-contrast barium enema in patients with rectal bleeding.
authors.forename: D W
authors.initials: DW
authors.lastname: Gelfand
authors.forename: D J
authors.initials: DJ
authors.lastname: Ott
mesh_terms: D001466:Barium Sulfate; D004733:Enema; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D011859:Radiography; D012007:Rectum / Q000000981:diagnostic imaging; D012812:Sigmoidoscopy
chemical_list: D001466:Barium Sulfate