1. Department of Radiology; Faculty of Medicine; University of Tsukuba; Tsukuba Japan
2. Department of Obstetrics and Gynecology; Faculty of Medicine; University of Tsukuba; Tsukuba Japan
3. Department of Gynecologic Oncology; National Cancer Center
4. Department of Obstetrics and Gynecology; Ibaraki Prefectural Central Hospital; Ibaraki Japan
5. Department of Radiology; Graduate School of Comprehensive Human Sciences; University of Tsukuba; Tsukuba Japan