1. Department of Abdominal Surgery, Guiqian International General Hospital, Guiyang, Guizhou, China
2. Department of General Surgery, First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
3. Department of Thoracic Surgery, First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
4. Department of Hepatobiliary and Pancreatic Surgery II, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China