1. Department of Gatroenterology, Hiroshima University Hospital, Hiroshima, Japan;
2. Department of Surgery, National Defense Medical College, Tokorozawa, Japan;
3. Department of Lower Gastrointestinal Medicine, Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan;
4. Department of Gastroenterological Surgery, Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan;
5. Department of Pathology, Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan;
6. Division of Endoscopy, Shizuoka Cancer Center, Shizuoka, Japan;
7. Department of Gastroenterology and Endoscopy, National Cancer Center Hospital East, Kashiwa, Japan;
8. Division of Pathology, Exploratory Oncology Research & Clinical Trial Center, National Cancer Center, Kashiwa, Japan;
9. Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan;
10. Department of Colorectal Surgery, National Cancer Center Hospital, Tokyo, Japan;
11. Pathology and Clinical Laboratory Division, National Cancer Center Hospital, Tokyo, Japan;
12. Department of Gastroenterology, Hiroshima City Asa Citizens Hospital, Hiroshima, Japan;
13. Coloproctology Center Takano Hospital, Kumamoto, Japan;
14. Department of Gastroenterology, Tochigi Cancer Center, Utsunomiya, Japan;
15. Department of Surgical Oncology, The University of Tokyo, Tokyo, Japan;
16. Digestive Disease Center, Asahikawa City Hospital, Hokkaido, Japan;
17. Second Department of Surgery, School of Medicine, Wakayama Medical University, Wakayama, Japan;
18. Department of Coloproctology, Aizu Medical Center, Fukushima Medical University, Fukushima, Japan;
19. Department of Gastroenterological Surgery, Aichi Cancer Center Hospital, Nagoya, Japan;
20. Department of Translational Oncology, Graduate School of Medical and Dental Science, Tokyo Medical and Dental University, Tokyo, Japan;
21. Department of Gastroenterology, National Hospital Organization Kure Medical Center and Chugoku Cancer Center, Kure, Japan;
22. Department of Surgery, Dokkyo Medical University Saitama Medical Center, Saitama, Japan;
23. Department of Gastroenterology, School of Medicine, Kurume University, Fukuoka, Japan;
24. Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan;
25. Department of Coloproctological Surgery, Juntendo University Faculty of Medicine, Tokyo, Japan;
26. Department of Molecular Diagnostic Pathology, School of Medicine, Iwate Medical University, Iwate, Japan;
27. Department of Gastrointestinal and Pediatric Surgery, Tokyo Medical University, Tokyo, Japan;
28. Digestive Disease Center, Akita Red Cross Hospital, Akita, Japan;
29. Department of Gastroenterology and Hepatology, Sapporo Medical University School of Medicine, Sapporo, Japan;
30. Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan;
31. Department of Gastroenterology, National Hospital Organization Tokyo Medical Center, Tokyo, Japan;
32. Department of Gastroenterology, Nippon Medical School, Graduate School of Medicine, Tokyo, Japan;
33. Department of Surgery, Tokyo Metropolitan Hiroo Hospital, Tokyo, Japan;
34. Tokyo Medical and Dental University, Tokyo, Japan.