1. Department of Obstetrics and Gynecology, National Defense Medical College Hospital, Tokorozawa, Saitama 359‑8513, Japan
2. Department of Clinical Oncology, National Defense Medical College Hospital, Tokorozawa, Saitama 359‑8513, Japan
3. Department of Basic Pathology, National Defense Medical College Hospital, Tokorozawa, Saitama 359‑8513, Japan