1. Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery University of Ulsan College of Medicine, Asan Medical Center Seoul South Korea
2. Department of Surgery Seoul National University Bundang Hospital Seongnam‐si South Korea
3. Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery Samsung Medical Center, Sungkyunkwan University School of Medicine Seoul South Korea
4. Department of Surgery Tohoku University Sendai Japan
5. Department of General‐Pediatric‐Hepatobiliary Pancreatic Surgery Kitasato University School of Medicine Sagamihara Japan
6. Department of Surgery and Oncology, Graduate School of Medical Sciences Kyushu University Fukuoka Japan
7. Department of Hepato‐Biliary‐Pancreatic Surgery Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital Tokyo Japan
8. Department of Hepatobiliary and Pancreatic Surgery, Graduate School of Medicine Tokyo Medical and Dental University Tokyo Japan
9. Division of HBP Surgery, Department of Surgery Yonsei University College of Medicine Seoul South Korea
10. Department of Surgery, Division of Hepatobiliary and Pancreatic Surgery Seoul National University Hospital, Seoul National University College of Medicine Seoul South Korea
11. Division of Hepato‐biliary and Pancreas Surgery, Department of Surgery Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea Seoul South Korea
12. Department of Surgery Gangnam Severance Hospital, Yonsei University College of Medicine Seoul South Korea
13. Division of Hepato‐Pancreato‐Biliary Surgery, Department of Surgery Chonnam National University Hospital, Chonnam National University Medical School Gwangju South Korea
14. Department of Surgery Gyeongsang National University Hospital, Gyeongsang National University, College of Medicine Jinju South Korea
15. Department of Surgery Kindai University Faculty of Medicine Higashi‐osaka Japan
16. Second Department of Surgery Wakayama Medical University Wakayama Japan
17. Department of General Surgery, Graduate School of Medicine Chiba University Chiba Japan
18. Hepatobiliary Pancreatic and Transplant Surgery Mie University Graduate School of Medicine Tsu Japan
19. Department of General and Gastroenterological Surgery Osaka Medical and Pharmaceutical University Japan
20. Division of Gastroenterological, Hepato‐Biliary‐Pancreatic, Transplantation and Pediatric Surgery, Department of Surgery Shinshu University School of Medicine Matsumoto Japan
21. Department of Gastroenterological and Pediatric Surgery Oita University Faculty of Medicine Oita Japan
22. Department of Surgery Nara Medical University Kashihara Japan
23. Kansai Rosai Hospital Amagasaki Japan
24. Department of Surgery Ulsan University Hospital, College of Medicine, University of Ulsan Ulsan South Korea
25. Department of Surgery Keimyung University Dongsan Hospital Daegu South Korea
26. Department of Clinical Epidemiology and Biostatistics Asan Medical Center Seoul South Korea
27. Department of Surgery Institute of Gastroenterology, Tokyo Woman's Medical University Tokyo Japan
28. Department of Gastroenterological Surgery Yokohama City University Yokohama Japan