1. Department of Obstetrics and Gynecology, Kindai University Faculty of Medicine, Osaka-Sayama, Japan.
2. Department of Pathology, Kindai University Faculty of Medicine, Osaka-Sayama, Japan.
3. Department of Gynecology and Obstetrics, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
4. Department of Immunology, Kindai University Faculty of Medicine, Osaka-Sayama, Japan.