Tokyo Medical University - Department of Gastroenterological Surgery, Sapporo City General Hospital - Kidney Transplant Surgery, University of Tokyo - Hepato-Biliary-Pancreatic Surgery Division, National Hospital Organization (NHO) - Department of Surgery, Kyushu University - Department of Surgery and Science, JCHO Sendai Hospital - Department of Surgery, Jichi Medical University - Department of Renal Surgery and Transplantation, Osaka University - Department of Advanced Technology for Transplantation, University of Tokyo - Department of Cardiovascular Surgery, Hiroshima University - Department of Gastroenterology and Metabolism, Toho University - Department of Nephrology, Akita University - Center for Kidney Disease and Transplantation, Hiroshima University - Department of Gastroenterology and Metabolism, Kanazawa Medical University - Department of Pediatric Surgery, Ehime University - Department of HPB and Breast Surgery, Okayama University - Department of Gastroenterological Surgery, Osaka University - Department of Gastroenterological Surgery, Keio University - Department of Surgery, Tokyo Medical University - Department of Gastroenterological Surgery, Tokyo Medical University - Department of Gastroenterological Surgery, Tokyo Medical University - Department of Gastroenterological Surgery, Jichi Medical University - Division of Virology, Jichi Medical University - Division of Virology and Tokyo Medical University - Department of Gastroenterological Surgery