1. The First Department of General Surgery, Changzheng Hospital, Second Military Medical University, Shanghai, China;
2. General Surgery Department, Dalian Municipal Center Hospital, Liaoning Province, Dalian, China;
3. The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai, China;
4. The Department of Hepatobiliary Pancreatic Surgery, Changhai Hospital, Second Military Medical University, Shanghai, China