1. Department of Obstetrics and Gynecology, Osaka University, Graduate School of Medicine, Osaka, Japan.
2. Department of Radiation Oncology, Osaka University, Graduate School of Medicine, Osaka, Japan.
3. Department of Obstetrics and Gynecology, Suita Tokusyukai Hospital, Osaka, Japan.
4. Department of Radiology, Suita Tokusyukai Hospital, Osaka, Japan.