title: Negative barium meal findings in upper gastrointestinal haemorrhage.
mesh_terms: D001466:Barium Sulfate; D005756:Gastritis / Q000150:complications / Q000175:diagnosis; D006471:Gastrointestinal Hemorrhage / Q000000981:diagnostic imaging* / Q000209:etiology; D005773:Gastroscopy; D006801:Humans; D011859:Radiography
chemical_list: D001466:Barium Sulfate