1. Department of Hepatobiliary Pancreatic and Transplant Surgery Mie University Graduate School of Medicine Mie Japan
2. Department of Surgery Kindai University Osaka Japan
3. Department of Gastroenterological Surgery Kagawa University Kagawa Japan
4. Department of Surgery Jikei University Kashiwa Hospital Chiba Japan
5. Department of Surgery Tohoku University Miyagi Japan
6. Department of Surgery Iwate Medical University Iwate Japan
7. Department of Surgery Kansai Medical University Osaka Japan
8. Department of Digestive and General Surgery Faculty of Medicine Shimane University Shimane Japan
9. Department of General Surgery Chiba University Chiba Japan
10. Department of Surgery Saitama Medical Center Jichi Medical University Saitama Japan
11. Department of Surgery Kure Medical Center and Chugoku Cancer Center Hiroshima Japan
12. Department of Surgery Jichi Medical University Tochigi Japan
13. Mie University Hospital Mie Japan
14. Tokyo Rosai Hospital Tokyo Japan