1. Mizuho Women's Clinic; Kokubunji Japan
2. Department of Biostatistics; Hokkaido University Graduate School of Medicine; Sapporo Japan
3. Division of Gynecologic Oncology; National Hospital Organization; Hokkaido Cancer Center; Sapporo Japan
4. Mio Fertility Clinic; Yonago Japan
5. Tasaka Clinic; Osaka Japan
6. Sutou Ladies Clinic; Osaka Japan
7. Minamimorimachi Ladies' Clinic; Osaka Japan
8. Department of Obstetrics, Gynecology and Andanestheology; Dozono Clinic; Kagoshima Japan
9. Sakura Josei Clinic; Chitose Japan
10. Mami Ladies Clinic; Hachinohe Japan
11. Sakamoto Tomomi Clinic; Hirosaki Japan
12. Rhythmic Obstetrics and Gynecology Clinic; Sapporo Japan
13. Ladies Clinic St. Cecilia; Aomori Japan
14. Yokohama First Health Check Place; Yokohama Japan
15. Kiyo Women's Clinic; Nara Japan
16. Hiroshima Ladies Clinic; Hiroshima Japan
17. Azabu Juban Manami Women's Clinic; Tokyo Japan
18. Kobiki Women's Clinic; Kawasaki Japan
19. Hokkaido Cancer Society; Sapporo Japan
20. Department of Obstetrics and Gynecology; Iwate Medical University School of Medicine; Morioka Japan
21. Sakura Women's Clinic; Hiroshima Japan
22. Department of Translational Research Management; Hokkaido University Graduate School of Medicine; Sapporo Japan
23. Kakinoki Hospital; Kagoshima Japan
24. Department of Obstetrics and Gynecology; Hirosaki University Graduate School of Medicine; Hirosaki Japan