1. Department of Gastroenterological Surgery, Graduate School of Medical, Osaka University, Osaka, Japan;
2. Department of Therapeutics for Inflammatory Bowel Diseases, Graduate School of Medical, Osaka University, Osaka, Japan;
3. Division of Health Sciences, Graduate School of Medical, Osaka University, Osaka, Japan;
4. Department of Surgery, Osaka Central Hospital, Osaka, Japan;
5. Department of Inflammatory Bowel Disease Surgery, Hyogo College of Medicine, Nishinomiya, Japan;
6. Department of Surgery, Fukuoka University Chikushi Hospital, Chikushino, Japan;
7. Department of Coloproctology, Tokyo Yamate Medical Center, Tokyo, Japan;
8. Department of Surgery, Osaka City University, Graduate School of Medicine, Osaka, Japan;
9. Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan;
10. Department of Surgery, Keio University, Tokyo, Japan;
11. Department of Surgery, Coloproctology Center Takano Hospital, Kumamoto, Japan;
12. Department of Infectious Diseases, Hiroshima University Hospital, Hiroshima, Japan;
13. Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan;
14. Department of Surgery and Oncology, Kyusyu University, Fukuoka, Japan;
15. Department of Gastrointestinal and Pediatric Surgery, Institute of Life Sciences, Mie University Graduate School of Medicine, Tsu, Japan;
16. Department of Surgery, Toho University Sakura Medical Center, Chiba, Japan;
17. Department of Surgery, National Defense Medical College, Tokorozawa, Japan;
18. Advanced Surgery Center, Sapporo Higashi Tokushukai Hospital, Sapporo, Japan;
19. Department of Surgery, Division of Inflammatory Bowel Disease Surgery, Tokyo Women's Medical University, Tokyo, Japan;
20. Inflammatory Bowel Disease Center, Yokohama City University Medical Centre, Yokohama, Japan;
21. Department of Surgery, Kyoto University Hospital, Kyoto, Japan;
22. Department of Gastrointestinal Surgery, Tokyo Medical and Dental University, Tokyo, Japan;
23. Department of Colorectal Surgery, Tohoku Rosai Hospital, Sendai, Japan;
24. Department of Surgery, Nara Medical University, Kashihara, Japan;
25. Department of Surgery, Fujita Health University, School of Medicine, Toyoake, Japan;
26. Department of Gastroenterological Surgery, Osaka City General Hospital, Osaka, Japan;
27. Kurume Coloproctology Center, Kurume, Japan;
28. Division of Digestive and General Surgery, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan;
29. Inflammatory Bowel Disease Center, Yokkaichi Hazu Medical Center, Yokkaichi, Japan;
30. Center for Gastroenterology, Department of Surgery, Urasoe General Hospital, Urasoe, Japan;
31. Department of Surgery, Teikyo University School of Medicine, Tokyo, Japan;
32. Department of General and Gastroenterological Surgery, Osaka Medical College, Takatsuki, Japan;
33. Department of Surgery, Kyorin University, Tokyo, Japan;
34. Department of Surgery, Kurume University Hospital, Kurume, Japan;
35. Department of Surgery, Tokyo Medical University Hospital, Tokyo, Japan;
36. Department of Gastroenterological Surgery, Nagoya University Hospital, Nagoya, Japan;
37. Department of Digestive Surgery, Nippon Medical School, Tokyo, Japan;
38. Department of Coloproctological Surgery, Japanese Red Cross Medical Center, Tokyo, Japan;
39. Department of Surgical Oncology, The University of Tokyo, Tokyo, Japan;
40. Department of Pathology, Niigata University, Niigata, Japan;
41. Tokyo Medical and Dental University, Tokyo, Japan.