1. Department of Obstetrics and Gynecology, National Hospital Organization Kyoto Medical Center, Kyoto, Japan.
2. Clinical Research Center, National Hospital Organization Kyoto Medical Center, Kyoto, Japan.
3. Department of Gynecology and Obstetrics, Kyoto University Graduate School of Medicine, Kyoto, Japan.
4. Department of Obstetrics and Gynecology, Iwate Medical University School of Medicine, Morioka, Japan.
5. Department of Obstetrics and Gynecology, Kindai University Faculty of Medicine, Osakasayama, Japan.