1. Department of Surgery, Surgical Oncology and Science Sapporo Medical University Sapporo Japan
2. Department of Colorectal Surgery National Cancer Center Hospital East Kashiwa Japan
3. Department of Gastroenterological Surgery Toranomon Hospital Tokyo Japan
4. Department of Surgery, Gastroenterological Center Yokohama City University Medical Center Yokohama Japan
5. Department of Gastroenterological Surgery, Faculty of Medicine Fukuoka University Fukuoka Japan
6. Department of Surgery Koseiren Takaoka Hospital Toyama Japan
7. Department of Gastroenterological and Pediatric Surgery Oita University Faculty of Medicine Yufu Japan
8. Department of Surgery Kindai University Faculty of Medicine Osakasayama Japan
9. Division of Surgical Oncology, Department of Surgery Nagoya University Graduate School of Medicine Nagoya Japan
10. Department of Coloproctological Surgery Juntendo University Faculty of Medicine Tokyo Japan
11. Division of Lower Gastrointestinal Surgery, Department of Gastroenterological Surgery Hyogo College of Medicine Nishinomiya Japan
12. Department of Surgery Fujita Health University, School of Medicine Toyoake Japan
13. Department of Gastroenterological Surgery Cancer Institute Hospital of the Japanese Foundation for Cancer Research Tokyo Japan
14. Department of Gastroenterological Surgery Saitama Medical University International Medical Center Hidaka Japan
15. Department of Surgery Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital Tokyo Japan
16. Department of Surgery Fujisawa Municipal Hospital Fujisawa Japan
17. Division of Biomarker Discovery, Exploratory Oncology Research & Clinical Trial Center National Cancer Center Kashiwa Japan
18. Department of Surgery, Graduate School of Medicine Kyoto University Kyoto Japan
19. Department of Surgery Kitasato University Kitasato Institute Hospital Tokyo Japan