1. Division of Hepato‐Biliary‐Pancreatic Surgery Shizuoka Cancer Center Hospital Nagaizumi Japan
2. Pathology Kyoto Prefectural University of Medicine Kyoto Japan
3. Cancer Prevention and Control Division Kanagawa Cancer Center Yokohama Japan
4. Gastrointestinal Medical Oncology National Cancer Center Hospital Tokyo Japan
5. Gastrointestinal Oncology Shizuoka Cancer Center Shizuoka Japan
6. Hepato‐Biliary‐Pancreatic Surgery National Cancer Center Hospital East Kashiwa Japan
7. Department of Gastrointestinal Surgery Kanagawa Cancer Center Yokohama Japan
8. Hepato‐Biliary‐Pancreatic Surgery Kobe University Kobe Japan
9. Surgery Ogaki Municipal Hospital Ogaki Japan
10. Gastrointestinal Surgery Aichi Cancer Center Hospital Nagoya Japan
11. Surgery National Hospital Organization Osaka National Hospital Osaka Japan
12. Gastrointestinal Surgery Jichi Medical University Shimotsuke Japan
13. Division of Metabolism and Biosystemic Science Department of Medicine Asahikawa Medical University Asahikawa Japan
14. Gastrointestinal Surgery Saitama Cancer Center Saitama Japan
15. Gastrointestinal Surgery Chiba Cancer Center Chiba Japan
16. Surgery Tochigi Cancer Center Utsunomiya Japan
17. Surgery Kasugai Municipal Hospital Kasugai Japan
18. Division of Surgical Oncology Department of Surgery Nagoya University Graduate of School of Medicine Nagoya Japan
19. Gastroenterological Surgery II Faculty of Medicine Hokkaido University Sapporo Japan
20. Clinical Trial Coordination Office Biostatistician Shizuoka Cancer Center Hospital Nagaizumi Japan