Early radiology in acute gastrointestinal haemorrhage.
D001466:Barium Sulfate; D004724:Endoscopy; D005336:Fiber Optic Technology; D006471:Gastrointestinal Hemorrhage / Q000000981:diagnostic imaging*; D006801:Humans; D011859:Radiography; D013997:Time Factors
D001466:Barium Sulfate