1. Department of Obstetrics and Gynecology Kurashiki Medical Center Okayama Japan
2. Department of Reproductive Medicine Hiroshima Prefectural Hospital Hiroshima Japan
3. Department of Obstetrics and Gynecology Higashihiroshima Medical Center Hiroshima Japan
4. Department of Gynecology Yasuda Hospital Hiroshima Japan
5. Hirata Women's Clinic Hiroshima Japan