1. Department of Surgery Keio University School of Medicine Tokyo Japan
2. Department of Surgery Hepato‐Pancreato‐Biliary Minimally Invasive and Robotic Unit Istituto Fondazione Poliambulanza Brescia Italy
3. Unit of Hepatobiliary Surgery and Liver Transplantation University Hospital Reina Sofía, IMIBIC Cordoba Spain
4. Department of Surgery Institute of Gastroenterology Tokyo Women's Medical University Tokyo Japan
5. Hepatobiliary Center Paul Brousse Hospital Villejuif France
6. Department of Surgery Graduate School of Medicine Kyoto University Kyoto Japan
7. Department of Gastroenterological and General Surgery School of Medicine Showa University Tokyo Japan
8. Department of Gastroenterological Surgery Hyogo College of Medicine Hyogo Japan
9. Department of Hepato‐Biliary‐Pancreatic and Gastrointestinal Surgery International University of Health and Welfare School of Medicine Chiba Japan
10. Department of Hepato‐Biliary‐Pancreatic Surgery Kyorin University Hospital Tokyo Japan
11. Department of Surgery and Science Graduate School of Medical Sciences Kyushu University Fukuoka Japan
12. Center for Advanced Treatment of Hepatobiliary and Pancreatic Diseases Ageo Central General Hospital Saitama Japan