1. Department of Hepatopancreatobiliary Surgery; The First Affiliated Hospital of Zhengzhou University; Zhengzhou China
2. Department of Hepatobiliary Surgery; The Second Affiliated Hospital, Chongqing Medical University; Chongqing China
3. Department of Bile Duct Surgery; West China Hospital, Sichuan University; Chengdu China
4. Department of Gastrointestinal Surgery; Yongchuan Hospital, Chongqing Medical University; Chongqing China