1. Department of Obstetrics & Gynecology Akita University School of Medicine Akita Japan
2. Department of Obstetrics & Gynecology Keio University School of Medicine Tokyo Japan
3. Department of Obstetrics and Gynecology Kameda Medical Center Kamogawa Japan
4. Department of Obstetrics and Gynecology Shinshu University School of Medicine Matsumoto Japan
5. Department of Obstetrics and Gynecology Nippon Medical School Tokyo Japan
6. Department of Obstetrics and Gynecology Hokkaido University Graduate School of Medicine Sapporo Japan
7. Department of Obstetrics and Gynecology The Jikei University School of Medicine Tokyo Japan
8. Department of Obstetrics and Gynecology Tottori University School of Medicine Yonago Japan
9. Department of Reproductive Medicine Graduate School of Medicine, Chiba University Chiba Japan