1. Cancer Healthcare Research Branch, Center for Uterine Cancer, and Center for Clinical Trials, National Cancer Center, Goyang, Korea.
2. Cancer Registration and Statistics Branch, National Cancer Center, Goyang, Korea.
3. Department of Obstetrics and Gynecology, CHA Gangnam Medical Center, CHA University School of Medicine, Seoul, Korea.
4. Department of Obstetrics and Gynecology, Research Institute of Medical Science, Konkuk University School of Medicine, Seoul, Korea.
5. Department of Obstetrics and Gynecology, Seoul National University Bundang Hospital, Seongnam, Korea.
6. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea.