1. Department of Hepatobiliary and Pancreatic Surgery, Tongliao City Hospital, Tongliao, China
2. Department of Pancreatic Cancer, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin’s Clinical Research Center for Cancer, Tianjin, China
3. Department of Gastroenterology, Digestive Endoscopy Unit, Tongliao City Hospital, Tongliao, China
4. Department of Gastrointestinal Oncology, the First Affiliated Hospital of Hainan Medical University, Haikou, China
5. Department of Gastrointestinal Pancreatic Surgery, Shanxi Provincial People’s Hospital, Taiyuan, China.