1. Department of Obstetrics and Gynecology, Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.
2. Department of Hospital Pathology, The Catholic University of Korea College of Medicine, Seoul, Korea.
3. Research Institute, SL BIGEN, Inc., Korea Bio Park, Seongnam, Korea.
4. Department of Obstetrics and Gynecology, St. Vincent's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.