1. Department of Digestive Surgery, Division of Gastroenterology and Hepatology; Nihon University School of Medicine; Tokyo Japan
2. Department of Plastic and Reconstructive Surgery, Division of Gastroenterology and Hepatology; Nihon University School of Medicine; Tokyo Japan
3. Department of Medicine, Division of Gastroenterology and Hepatology; Nihon University School of Medicine; Tokyo Japan
4. Hepato-Biliary-Pancreatic Surgery and Transplantation Division, Department of Surgery; Japanese Red Cross Medical Center; Tokyo Japan