1. Department of General Surgery, Graduate School of Medicine; Chiba University; 1-8-1 Inohana Chuoh-ku Chiba 260-8670 Japan
2. Department of Biliary-Pancreatic Surgery; Fujita Health University; Aichi Japan
3. Division Surgical Oncology, Department of Surgery; Nagoya University Graduate School of Medicine; Nagoya Japan
4. Department of Surgery, Institute of Gastroenterology; Tokyo Women's Medical University; Tokyo Japan
5. Department of Surgery, Division of Hepato-Biliary-Pancreatic Surgery; The University of Tokyo; Tokyo Japan
6. Department of Surgery; Teikyo University School of Medicine; Tokyo Japan
7. Department of Gastroenterological Surgery; Yokohama City University Graduate School of Medicine; Yokohama Japan
8. Department of Surgery; Tohoku University Graduate School of Medicine; Sendai Japan
9. Department of Surgical Oncology and Regulation of Organ Function; Miyazaki University School of Medicine; Miyazaki Japan
10. Department of General Surgery & Pancreatic Surgery; Fujita Health University; Aichi Japan
11. Department of Surgery; Kurume University School of Medicine; Fukuoka Japan
12. Department of Digestive Surgery and Surgical Oncology; Yamaguchi University Graduate School of Medicine; Yamaguchi Japan
13. Second Department of Surgery; Dokkyo Medical University; Tochigi Japan
14. Depaertment of Surgery; Kyorin University; Tokyo Japan
15. Division of Hepato-Biliary-Pancreatic Surgery and Transplantation, Department of Surgery, Graduate School of Medicine; Kyoto University; Kyoto Japan
16. Department of Digestive and Pediatric Surgery, Institute of Health Biosciences; University of Tokushima Graduate School of Medicine; Tokushima Japan
17. Department of Gastroenterological Surgery, Faculty of Medicine; Kagawa University; Kagawa Japan
18. Department of Gastroenterology, Second Teaching Hospital; Fujita Health University; Nagoya Japan
19. Department of General Internal Medicine; Hiroshima University Graduate School; Hiroshima Japan
20. Department of Medical Oncology; Kyorin University School of Medicine; Tokyo Japan
21. Department of Pathology; Kyoto Prefectural University of Medicine; Kyoto Japan
22. Department of Human Pathology; Kanazawa University Graduate School of Science; Kanazawa Japan
23. Department of Pathology and Bioscience; Hirosaki University Graduate School of Medicine; Aomori Japan