1. Department of Obstetrics & Gynecology, Nara Medical University
2. Department of Obstetrics & Gynecology, Nagoya City West Medical Center
3. Department of Obstetrics & Gynecology, Osaka City General Hospital
4. Department of Obstetrics & Gynecology, Juntendo University
5. Department of Obstetrics & Gynecology, Tohoku University
6. Department of Obstetrics & Gynecology, Osaka University
7. Department of Obstetrics & Gynecology, Japanese Red Cross Katsushika Maternity Hospital
8. Department of Obstetrics & Gynecology, Hokkaido University
9. Department of Obstetrics & Gynecology, Saitama Medical University
10. Department of Obstetrics & Gynecology, Tokyo Medical University Hachioji Medical Center
11. Department of Obstetrics & Gynecology, Ohno Ladies’ Clinic
12. Department of Obstetrics & Gynecology, Hamamatsu Medical University
13. Department of Obstetrics & Gynecology, Nagoya University
14. Department of Obstetrics & Gynecology, Hirosaki University
15. Department of Obstetrics & Gynecology, Aichi Medical University