1. Division of Hepato‐Biliary‐Pancreatic Surgery and Transplantation, Department of Surgery, Graduate School of Medicine Kyoto University Kyoto Japan
2. Department of Gastroenterological Surgery and Oncology The Tazuke Kofukai Medical Research Institute, Kitano Hospital Osaka Japan
3. Division of Immunology, Institute for Frontier Life and Medical Sciences Kyoto University Kyoto Japan