1. Department of Gastroenterological Surgery; Graduate School of Life Sciences; Kumamoto University; Kumamoto Japan
2. Division of Hepatobiliary and Pancreatic Surgery; Department of Surgery; Kurume University; Kurume Japan
3. Department of Surgery; Nagasaki University Graduate School of Biomedical Sciences; Nagasaki Japan
4. Department of Surgery; Saga University Faculty of Medicine; Saga Japan
5. Department of Surgery; Nippon Medical School; Tokyo Japan
6. Department of Digestive Surgery, Breast and Thyroid Surgery; Graduate School of Medicine; Kagoshima University; Kagoshima Japan
7. Department of Surgery and Science; Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan
8. Department of Gastroenterological and Pediatric Surgery; Oita University Faculty of Medicine; Oita Japan
9. Department of Surgical Oncology and Regulation of Organ Function; Miyazaki University School of Medicine; Miyazaki Japan
10. Division of Surgical Oncology and Department of Surgery; Nagasaki University Graduate School of Biomedical Sciences; Nagasaki Japan
11. Department of Gastroenterological Surgery; Fukuoka University School of Medicine; Fukuoka Japan
12. First Department of Surgery; Faculty of Medicine; University of the Ryukyu; Okinawa Japan
13. Department of Hepato-Biliary-Pancreatic Surgery; Clinical Research Institute; National Hospital Organization Kyushu Medical Center; Fukuoka Japan
14. Department of Surgery; Gastroenterology and Hepatology Center; Kitakyushu City Yahata Hospital; Kitakyushu Japan
15. Medical Quality Management Center; Kumamoto University; Kumamoto Japan
16. Clinical Research Center and Department of Surgery; National Hospital Organization Nagasaki Medical Center; Nagasaki Japan