1. Department Obstetrics and Gynecology Tottori University
2. Department Obstetrics and Gynecology Nagasaki University
3. Department Obstetrics and Gynecology Kyoto Prefectural University of Medicine
4. Department Obstetrics and Gynecology The University of Tokyo
5. Department Obstetrics and Gynecology Aiiku Hospital
6. Department Obstetrics and Gynecology Shiga University of Medical Science
7. Department Obstetrics and Gynecology Oita University
8. Department of Gynecology and Obstetrics Kyoto University Graduate School of Medicine