1. Department of Medical Science, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Family Medicine, Seoul National University College of Medicine, Seoul, Korea.
3. Research Institute and Hospital, National Cancer Center, Goyang, Korea.
4. Center for Uterine Cancer, National Cancer Center, Goyang, Korea.
5. Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
6. Department of Obstetrics and Gynecology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
7. Department of Obstetrics and Gynecology, Gangnam CHA Hospital, CHA University College of Medicine, Seoul, Korea.
8. Department of Obstetrics and Gynecology, Keimyung University School of Medicine, Daegu, Korea.
9. Department of Obstetrics and Gynecology, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Korea.