1. Department of Surgery Nagasaki University Graduate School of Biomedical Sciences Nagasaki Japan
2. Hepato‐Biliary‐Pancreatic Surgery Division Artificial Organ and Transplantation Division Department of Surgery Graduate School of Medicine The University of Tokyo Bunkyo‐ku Japan
3. Department of Surgery Hyogo College of Medicine Nishinomiya Japan
4. Department of Surgery National Center for Global Health and Medicine Tokyo Japan
5. Department of Surgery National Hospital Organization Osaka National Hospital Osaka Japan
6. Division of Surgical Oncology Department of Surgery Nagoya University Graduate School of Medicine Nagoya Japan
7. Department of Surgery Nara Medical University Kashihara‐shi Japan
8. Department of Gastroenterological and Transplant Surgery Graduate School of Biomedical and Health Sciences Hiroshima University Hiroshima Japan
9. Department of Surgery Teikyo University School of Medicine Itabashi‐Ku Japan
10. Department of Surgery Japanese Red Cross Kumamoto Hospital Kumamoto Japan
11. Department of Surgery Iwate Medical University Morioka Japan
12. Department of Gastrointestinal and Hepato‐Biliary‐Pancreatic Surgery Faculty of Medicine University of Tsukuba Tsukuba Japan
13. Department of Surgery Keio University School of Medicine Shinjuku‐ku Japan
14. Department of Surgical Oncology and Gastroenterological Surgery Sapporo Medical University School of Medicine Sapporo Japan
15. Department of Surgery Shiga University of Medical ScienceSeta Tsukiniwa‐Cho Otsu Japan
16. Department of Hepato‐Biliary‐Pancreatic Surgery Kobe University Graduate School of Medicine Kobe Japan
17. Departments of Gastroenterological and Pediatric Surgery Oita University Faculty of Medicine Yufu Japan
18. Department of Surgery Toyama Prefectural Central Hospital Toyama Japan
19. Department of Surgery Kyoto Second Red Cross Hospital Kyoto Japan
20. Department of Digestive and General Surgery Graduate School of Medicine University of the Ryukyus Okinawa Japan
21. Department of Surgery Meiwa Hospital Nishinomiya Japan
22. Department of Surgery Faculty of Medicine Kindai University Osakasayama Japan
23. Department of Gastrointestinal and Pediatric Surgery Tokyo Medical University Tokyo Japan
24. Department of Gastroenterological Surgery I Graduate School of Medicine Hokkaido University Sapporo Japan
25. Department of Hepato‐Biliary‐Pancreatic and Transplant Surgery Fukushima Medical University Fukushima Japan
26. Department of Hematology Graduate School of Medicine Hokkaido University Sapporo Japan