1 Department of Gastroenterology, Digestive Endoscopy Center, Changhai Hospital, Naval Medical University, 168 Changhai Road, Shanghai 200433, China; Shanghai Institute of Pancreatic Diseases, 168 Changhai Road, Shanghai 200433, China.
2 Department of Gastroenterology, Digestive Endoscopy Center, Changhai Hospital, Naval Medical University, 168 Changhai Road, Shanghai 200433, China; Shanghai Institute of Pancreatic Diseases, 168 Changhai Road, Shanghai 200433, China. Electronic address: liaozhuan@smmu.edu.cn.