1. Department of Obstetrics and Gynecology, Daejeon St. Mary’s Hospital, The Catholic University of Korea, Daejeon, Korea.
2. Center for Gynecologic Cancer, National Cancer Center, Goyang, Korea.
3. Biostatistics Collaboration Team, Research Core Center, National Cancer Center, Goyang, Korea.
4. Department of Obstetrics and Gynecology, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Korea.