1. College of Medicine, The Catholic University of Korea, Seoul 06591, Republic of Korea
2. Department of Obstetrics and Gynecology, College of Medicine, The Catholic University of Korea, Seoul 06591, Republic of Korea
3. Department of Radiology, College of Medicine, The Catholic University of Korea, Seoul 06591, Republic of Korea
4. Department of Hospital Pathology, College of Medicine, The Catholic University of Korea, Seoul 06591, Republic of Korea