1. Second Department of Surgery Dokkyo Medical University Tochigi Japan
2. Hepato‐Biliary‐Pancreatic Surgery Division Artificial Organ and Transplantation Division Department of Surgery Graduate School of Medicine University of Tokyo Tokyo Japan
3. Department of Hepatobiliary and Pancreatic Oncology National Cancer Center Hospital Tokyo Japan
4. Division of Hepato‐Biliary‐Pancreatic Surgery and Transplantation Department of Surgery Kyoto University Kyoto Japan
5. Department of Hepatobiliary and Pancreatic Surgery Graduate School of Medicine Tokyo Medical and Dental University Tokyo Japan
6. Department of Surgery Kansai Electric Power Hospital Osaka Japan
7. Department of Gastroenterological Surgery Hyogo College of Medicine Hyogo Japan
8. Neuroendocrine Tumor Center Fukuoka Sanno Hospital International University of Health and Welfare Fukuoka Japan
9. Division of Diagnostic Pathology Nippon Koukan Hospital Kanagawa Japan
10. Department of Pathology Keio University School of Medicine Tokyo Japan
11. Department of Surgery Tohoku University School of Medicine Miyagi Japan
12. Department of Surgery National Center for Global Health and Medicine Tokyo Japan