1. Department of Surgery; Kansai Medical University; Moriguchi Japan
2. Second Department of Surgery; Wakayama Medical University School of Medicine; Wakayama Japan
3. Department of Surgical Oncology; Hokkaido University Graduate School of Medicine; Sapporo Japan
4. Department of Hepatobiliary Pancreatic Surgery; National Cancer Center Hospital East; Kashiwa Japan
5. Department of Gastroenterological Surgery (Surgery II); Nagoya University Graduate School of Medicine; Nagoya Japan
6. Department of Surgery, Graduate School of Medicine; Osaka University; Suita Japan
7. Department of Surgery; Nara Medical University Graduate School of Medicine; Nara Japan
8. Department of Surgery; Teikyo University School of Medicine; Tokyo Japan
9. Department of Surgical Oncology; Kagoshima University; Kagoshima Japan
10. Department of General Surgery; Chiba University, Graduate School of Medicine; Chiba Japan
11. The Japanese Society of Hepato-Biliary-Pancreatic Surgery; Tokyo Japan