Endoscopic retrograde cholangiopancreatography for unexplained upper abdominal pain.
D000005:Abdomen; D001660:Biliary Tract Diseases / Q000601:surgery; D002758:Cholangiography; D004724:Endoscopy; D006801:Humans; D010146:Pain / Q000000981:diagnostic imaging* / Q000209:etiology; D010179:Pancreas / Q000000981:diagnostic imaging