1. Department of Obstetrics and Gynecology Iwate Medical University School of Medicine Iwate Japan
2. Department of Obstetrics and Gynecology Niigata University School of Medicine Niigata Japan
3. Department of Gynecology Shizuoka Cancer Center Shizuoka Japan
4. Department of Obstetrics and Gynecology The Jikei University School of Medicine Tokyo Japan
5. Department of Obstetrics and Gynecology Tottori University School of Medicine Tottori Japan
6. Department of Obstetrics and Gynecology Faculty of Medicine Yamagata University Yamagata Japan
7. Department of Gynecology Aichi Cancer Center Hospital Aichi Japan
8. Department of Biostatistics Kitasato Academic Research Organization Kitasato University Tokyo Japan
9. Department of Gynecologic Oncology Osaka International Cancer Institute Osaka Japan
10. Department of Obstetrics and Gynecology Faculty of Medicine Toho University Tokyo Japan
11. Department of Gynecology Cancer Institute Hospital Tokyo Japan
12. Department of Obstetrics and Gynecology St. Mary’s Hospital Fukuoka Japan