1. Division of Health Services Research, Institute for Cancer Control National Cancer Center Tokyo Japan
2. Department of Public Health and Health Policy, Graduate School of Medicine University of Tokyo Tokyo Japan
3. Center for Cancer Registry, Institute for Cancer Control National Cancer Center Tokyo Japan
4. Department of Gynecology Saitama Cancer Center Saitama Japan
5. Department of Obstetrics and Gynecology University of Tsukuba, Institute of Medicine Tsukuba Japan
6. Department of Obstetrics and Gynecology, Faculty of Medicine Kindai University Osaka‐sayama Osaka Japan
7. Department of Obstetrics and Gynecology Hirosaki University Graduate School of Medicine Aomori Japan
8. Department of Obstetrics and Gynecology Nihon University School of Medicine Tokyo Japan
9. Division of Gynecology Shizuoka Cancer Center Shizuoka Japan
10. Department of Obstetrics and Gynecology Shimane University School of Medicine Shimane Japan
11. Department of Pathology Saitama Medical University International Medical Center Saitama Japan
12. Department of Experimental Therapeutics/Medical Oncology National Cancer Center Hospital East Kashiwa Chiba Japan
13. Department of Obstetrics and Gynecology Tokai University Kanagawa Japan
14. Department of Gynecology Tohoku University Hospital Miyagi Japan
15. Department of Gynecology Otaru General Hospital Hokkaido Japan
16. Department of Obstetrics and Gynecology Tokyo Women's Medical University Tokyo Japan
17. Department of Obstetrics and Gynecology Kyorin University Faculty of Medicine Tokyo Japan
18. Department of Obstetrics and Gynecology, Faculty of Medicine Yamagata University Yamagata Japan
19. Department of Obstetrics and Gynecology, Faculty of Life Sciences Kumamoto University Kumamoto Japan