1. Study Group for Ovary Metastasis from Colorectal Cancer by the Japanese Society for Cancer of the Colon and Rectum
2. Division of Colon and Rectal Surgery Shizuoka Cancer Center Shizuoka Japan
3. Department of Gastrointestinal Surgery Tokyo Medical and Dental University Tokyo Japan
4. Department of Gastroenterological Surgery Cancer Institute Hospital of Japanese Foundation for Cancer Research Tokyo Japan
5. Department of Gastroenterological Surgery Osaka International Cancer Institute Osaka Japan
6. Department of Surgery Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital Tokyo Japan
7. Department of Surgery Fujita Health University Hospital Toyoake Japan
8. Department of Gastrointestinal Hepato‐Biliary‐Pancreatic Surgery Nippon Medical School Tokyo Japan
9. Department of Surgical Oncology, Faculty of Medicine The University of Tokyo Tokyo Japan
10. Department of Gastroenterological Surgery Saitama Medical University International Medical Center Saitama Japan
11. Department of Gastroenterological Surgery Aichi Cancer Center Hospital Nagoya Japan
12. Department of Gastroenterological Surgery Niigata Cancer Center Hospital Niigata Japan
13. Department of Gastroenterological Surgery Yamagata Prefectural Central Hospital Yamagata Japan
14. Department of Colorectal Surgery National Cancer Center Hospital Tokyo Japan
15. Department of Surgery Kurume University School of Medicine Kurume Japan
16. Department of Surgery Tochigi Cancer Center Tochigi Japan
17. Department of Gastrointestinal and Pediatric Surgery, Division of Reparative Medicine, Institute of Life Sciences Mie University Graduate School of Medicine Tsu Japan
18. Department of Surgery Matsuyama Red Cross Hospital Matsuyama Japan
19. Division of Medical Safety Section Shiga University of Medical Science Otsu Japan
20. Division of Surgical Oncology, Department of Surgery Nagoya University Graduate School of Medicine Nagoya Japan
21. Department of Coloproctological Surgery Juntendo University Faculty of Medicine Tokyo Japan
22. Department of Biostatistics, Clinical Research Center Shizuoka Cancer Center Shizuoka Japan
23. Tokyo Medical and Dental University Tokyo Japan
24. Division of Molecular and Diagnostic Pathology, Graduate School of Medical and Dental Sciences Niigata University Niigata Japan