title: GI bleeding: identifying the source.
authors: University of Southern California School of Medicine, Los Angeles.
authors: L
authors: L
authors: Laine
mesh_terms: D004724:Endoscopy; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis / Q000209:etiology / Q000628:therapy; D006396:Hematemesis / Q000175:diagnosis / Q000209:etiology; D006801:Humans; D013276:Stomach Ulcer / Q000175:diagnosis / Q000503:physiopathology