SOD1 and Gastrointestinal hemorrhage: In ERCP group, 65 cases were excluded due to biliary malignant stricture (21 cases), pancreatolithiasis (18 cases), gastrojejunostomy surgery (7 cases), previous ERCP (6 cases), gastrointestinal hemorrhage (4 cases), SOD (4 cases), pancreas divisum (3 cases) and biliary thrombus (2 cases).