1. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea.
2. Center for Uterine Cancer, Research Institute and Hospital, National Cancer Center, Goyang, Korea.
3. Gynecologic Cancer Branch, Research Institute and Hospital, National Cancer Center, Goyang, Korea.
4. Department of Cancer Control and Policy, Graduate School of Cancer Science and Policy, National Cancer Center, Goyang, Korea.
5. Cancer Registration and Statistics Branch, National Cancer Control Institute, National Cancer Center, Goyang, Korea.