1. Department of Gastroenterology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
2. Department of Biliary–Pancreatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
3. Department of Gastroenterology, Xiaogan Hospital Affiliated to Wuhan University of Science and Technology, Wuhan, China