1. Department of Surgery Coloproctology Center Takano Hospital Kumamoto Japan
2. Department of Gastroenterological Surgery Aichi Cancer Center Hospital Aichi Japan
3. Division of Colon and Rectal Surgery Shizuoka Cancer Center Hospital Shizuoka Japan
4. Department of Gastroenterological Surgery Cancer Institute Hospital of the Japanese Foundation for Cancer Research Tokyo Japan
5. Department of Colorectal Surgery National Cancer Center Hospital East Chiba Japan
6. Department of Surgery Kyoto University Hospital Kyoto Japan
7. Department of Gastroenterological Surgery Tokai University School of Medicine Kanagawa Japan
8. Department of Gastrointestinal Surgery Kanagawa Cancer Center Kanagawa Japan
9. Department of Surgical Oncology The University of Tokyo Tokyo Japan
10. Department of Colorectal Surgery National Cancer Center Hospital Tokyo Japan
11. Department of Surgery National Defense Medical College Saitama Japan
12. Department of Digestive and General Surgery, Graduate School of Medicine University of Ryukyus Okinawa Japan
13. International Medical Center Fujita Health University Hospital Aichi Japan
14. Department of Surgery Kindai University Faculty of Medicine Osaka Japan
15. Department of Surgery Kurume University School of Medicine Fukuoka Japan
16. Department of Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital Tokyo Japan
17. Department of Gastroenterological Surgery, Graduate School of Medicine Osaka University Osaka Japan
18. Department of Clinical Oncology Kochi Health Sciences Center Kochi Japan
19. Department of Coloproctological Surgery Japanese Red Cross Medical Center Tokyo Japan
20. Department of Surgery Kyorin University Faculty of Medicine Tokyo Japan
21. Digestive Disease Center Showa University Northern Yokohama Hospital Kanagawa Japan
22. Department of Surgery1, School of Medicine University of Occupational and Environmental Health Fukuoka Japan
23. Department of Surgery Tohoku University Graduate School of Medicine Miyagi Japan
24. Department of Gastroenterological Surgery Toho University Omori Medical Center Tokyo Japan
25. Department of Surgery, Gastroenterological Center Yokohama City University Medical Center Kanagawa Japan
26. Department of Gastrointestinal Surgery Tokyo Medical and Dental University Tokyo Japan
27. Department of Gastroenterological Surgery Saitama Medical University International Medical Center Saitama Japan
28. Department of Surgery Teikyo University School of Medicine Tokyo Japan
29. Division of Lower Gastrointestinal Surgery, Department of Surgery Hyogo College of Medicine Hyogo Japan
30. Department of Gastroenterological Surgery Yamagata Prefectural Central Hospital Yamagata Japan
31. Department of Cancer Center Hokkaido University Hospital Hokkaido Japan
32. Department of Surgery Teikyo University Chiba Medical Center Chiba Japan
33. Department of Coloproctological Surgery Juntendo University Faculty of Medicine Tokyo Japan
34. Department of Surgery Hiroshima City Hiroshima Citizens Hospital Hiroshima Japan
35. Department of Digestive Tract and General Surgery, Saitama Medical Center Saitama Medical University Saitama Japan
36. Department of Surgery and Science, Graduate School of Medical Sciences Kyushu University Fukuoka Japan
37. Department of Surgery Tokyo Metropolitan Hiroo Hospital Tokyo Japan
38. Department of Digestive Surgery, Breast and Thyroid Surgery, Graduate School of Medicine and Dental Sciences Kagoshima University Kagoshima Japan
39. Department of Surgery Matsuyama Red Cross Hospital Ehime Japan
40. Department of Surgery Saiseikai Yokohamashi Nanbu Hospital Kanagawa Japan
41. Department of Coloproctology, Aizu Medical Center Fukushima Medical University Fukushima Japan
42. Department of Pathology Fukuoka University Chikushi Hospital Fukuoka Japan
43. Division of Gastrointestinal Surgery Kansai Medical University Hospital Osaka Japan
44. Division of Molecular and Diagnostic Pathology Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
45. Department of Medical Information Sciences and Administration Planning Kumamoto University Hospital Kumamoto Japan
46. Tokyo Medical and Dental University Tokyo Japan