title: Clinical approach to diagnostic endoscopy in patients with upper gastrointestinal bleeding.
mesh_terms: D001466:Barium Sulfate; D003937:Diagnosis, Differential; D003951:Diagnostic Errors; D004724:Endoscopy / Q000379:methods*; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D011292:Premedication; D011859:Radiography; D013997:Time Factors
chemical_list: D001466:Barium Sulfate