1. Department of Obstetrics and Gynecology, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
2. Department of Obstetrics and Gynecology, Korea University Ansan Hospital, Korea University College of Medicine, Seoul, Korea.
3. Department of Cancer Control and Population Health, Graduate School of Cancer Science and Policy, National Cancer Center, Goyang, Korea.
4. Department of Internal Medicine, Korea Medical Institute, Seoul, Korea.