1. Aichi Cancer Center Nagoya Japan
2. Department of Gastroenterological Surgery II Faculty of Medicine Hokkaido University Sapporo Japan
3. Department of Surgery Saitama Medical Center Dokkyo Medical University Koshigaya Japan
4. Second Department of Surgery Dokkyo Medical University Mibu Japan
5. Division of Hepato‐Biliary‐Pancreatic Surgery Shizuoka Cancer Center Nagaizumi Japan
6. Department of Surgery Tohoku University Graduate School of Medicine Sendai Japan
7. Department of Surgery Nagoya University Graduate School of Medicine Nagoya Japan
8. Department of Hepatobiliary Pancreatic Surgery National Cancer Center Hospital East Kashiwa Japan
9. Department of Surgery Teikyo University School of Medicine Tokyo Japan
10. Hepatobiliary and Pancreatic Surgery Division National Cancer Center Hospital Tokyo Japan
11. Department of Surgery Teikyo University Chiba Medical Center Ichihara Japan
12. Department of Surgery Institute of Gastroenterology Tokyo Women’s Medical University Tokyo Japan
13. Division of Digestive and General Surgery Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
14. Department of Gastroenterology Graduate School of Medicine Juntendo University Tokyo Japan
15. Department of Hepatobiliary and Pancreatic Oncology National Cancer Center Hospital Tokyo Japan
16. Department of Gastroenterology Chiba Prefectural Sawara Hospital Sawara Japan
17. Department of Gastroenterology and Gastroenterological Oncology Fujita Health University Toyoake Japan
18. Department of Medical Oncology Faculty of Medicine Kyorin University Mitaka Japan
19. Education and Research Center Teine‐Keijinkai Hospital Sapporo Japan
20. Department of Radiology Aichi Medical University Nagakute Japan
21. Department of Radiology Graduate School of Medical Science Kyoto Prefectural University of Medicine Kyoto Japan
22. Department of Pathology and Bioscience Hirosaki University Graduate School of Medicine Hirosaki Japan
23. Department of Pathology Japanese Red Cross Kyoto Diichi Hospital Kyoto Japan
24. Department of Hepato‐Biliary‐Pancreatic & Gastrointestinal Surgery International University of Health and Welfare Ichikawa Japan
25. Department of Gastroenterological Surgery Graduate School of Medicine Yokohama City University Yokohama Japan