1. Department of Obstetrics and Gynecology Nara Medical University Kashihara Japan
2. Department of Obstetrics and Gynecology Showa University School of Medicine Tokyo Japan
3. Department of Gynecology Kitasato University, Kitasato Institute Hospital Tokyo Japan
4. Department of Obstetrics and Gynecology Faculty of Medicine, Saitama Medical University Saitama Japan
5. Department of Obstetrics and Gynecology Tokyo Dental College Ichikawa General Hospital Ichikawa Japan
6. Department of Reproductive Health Nursing School of Health Science, Faculty of Medicine, Kagoshima University Kagoshima Japan
7. Center for Maternal‐Fetal Neonatal and Reproductive Medicine, National Center for Child Health and Development Tokyo Japan
8. Department of Gynecology and Obstetrics Kyoto University Graduate School of Medicine Kyoto Japan
9. Department of Obstetrics and Gynecology Nippon Medical School Tokyo Japan
10. Department of Obstetrics and Gynecology The University of Tokyo Tokyo Japan
11. Obstetrics and Gynecology Tatedebari Sato Hospital Takasaki Japan
12. Department of Obstetrics and Gynecology Saitama Medical Center, Saitama Medical University Kawagoe Japan
13. Department of Obstetrics and Gynecology Toho University Ohashi Medical Center Tokyo Japan
14. Women's Clinic We! Toyama Toyama Japan
15. Department of Women's Health Tokyo Medical and Dental University Tokyo Japan
16. Division of Gynecologic Oncology National Hospital Organization, Hokkaido Cancer Center Sapporo Japan
17. Sports Medical Center Japan Institute of Sports Sciences Tokyo Japan
18. Clinic Ms SOPHIA Hamamatsu Japan
19. Department of Obstetrics and Gynecology Iwate Medical University School of Medicine, Shiwa
20. Ikegami General Hospital Tokyo Japan
21. Department of Obstetrics and Gynecology School of Medicine, Fujita Health University Toyoake Japan
22. Division of Infection Control and Prevention Kokura Memorial Hospital Kitakyusyu Japan
23. Department of Obstetrics and Gynecology Kitasato University School of Medicine Sagamihara Japan
24. Department of Obstetrics and Gynecology Wakamatsu Hospital of University of Occupational and Environmental Health Kitakyushu Japan
25. Maeda Clinic Yaizu Japan
26. Department of Obstetrics and Gynecology Hiroshima University Hiroshima Japan