Accuracy and reliability of endoscopy and x-ray in upper gastrointestinal bleeding.
D003937:Diagnosis, Differential; D003951:Diagnostic Errors; D004724:Endoscopy; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000601:surgery; D006801:Humans; D011859:Radiography