1. Department of Obstetrics and Gynecology, Inha University Hospital, Incheon, Korea.
2. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Obstetrics and Gynecology, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Korea.
4. Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea.