1. Department of Obstetrics and Gynecology, Chungbuk National University Hospital, Cheongju, Korea.
2. Department of Obstetrics and Gynecology, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Surgical Oncology, Sheikh Khalifa Specialty Hospital, Ras Al Khaimah, United Arab Emirates.