1. Department of Surgery Teikyo University School of Medicine Tokyo Japan
2. Department of Hepato‐Biliary‐Pancreatic and Transplant Surgery Mie University Graduate School of Medicine Tsu Japan
3. Department of Hepato‐Biliary‐Pancreatic and Gastrointestinal Surgery School of Medicine International University of Health & Welfare Ichikawa Japan
4. Department of Gastroenterological Surgery Fujita Health University Bantane Hospital Nagoya Japan
5. Aichi Developmental Disability Center Kasugai Japan
6. Toyota Regional Medical Center Toyota Japan
7. Department of Gastroenterology Ogaki Municipal Hospital Ogaki Japan
8. Office of Medical Education and Center of Infection Diseases International University of Health and Welfare Narita Japan
9. Department of Gastroenterology and Hepatology Tokyo Medical University Tokyo Japan
10. Department of Surgery Institute of Gastroenterology Tokyo Women’s Medical University Tokyo Japan
11. Department of Surgery Keio University Tokyo Japan
12. Department of Surgery Center for Gastroenterology and Liver Surgery Kitakyushu City Yahata Hospital Kitakyushu Japan
13. Department of Surgery Fujinomiya City General Hospital Fujinomiya Japan
14. Department of Surgery Tsudanuma Central General Hospital Narashino Japan
15. Department of Gastroenterological Surgery School of Medicine Yokohama City University Yokohama Japan
16. Department of Surgery Minimally Invasive Surgery Center Yotsuya Medical Cube Tokyo Japan
17. Department of Clinical Pathology and Laboratory MedicineKawasaki Medical School Kurashiki City Japan
18. Department of Radiology Kanazawa University Hospital Kanazawa Japan
19. Department of Surgery Matsusaka Chuo General Hospital Matsusaka Japan
20. Department of Gastroenterology Chiba Prefectural Sawara Hospital Katori Japan
21. Department of Surgery Shizuoka City Shimizu Hospital Shizuoka Japan
22. Department of General, Pediatric and Hepato‐Biliary‐Pancreatic Surgery Kitasato University Sagamihara Japan
23. Department of Surgery Toho University Ohashi Medical Center Tokyo Japan
24. Department of Surgery and Oncology Graduate School of Medical Sciences Kyushu University Fukuoka Japan
25. Department of Internal Medicine Teikyo University School of Medicine Tokyo Japan
26. Department of Hepato‐Biliary‐Pancreatic Surgery and Transplantation Kanazawa University Kanazawa Japan
27. Biostatistics Center Kurume University Kurume Japan
28. Department of Digestive Surgery Nippon Medical School Musashikosugi Hospital Kawasaki Japan
29. Department of Surgery Tohoku University Graduate School of Medicine Sendai Japan
30. Utsunomiya Memorial Hospital Utsunomiya Japan
31. Department of Emergency Medicine School of Medicine University of Occupational and Environmental Health Fukuoka Japan