title: Letter: Emergency endoscopy in gastrointestinal bleeding.
mesh_terms: D000328:Adult; D000368:Aged; D001466:Barium Sulfate; D004630:Emergencies; D004636:Emergency Service, Hospital; D004724:Endoscopy; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D008875:Middle Aged; D011859:Radiography; D013997:Time Factors
chemical_list: D001466:Barium Sulfate