1. Department of Radiology, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea
2. Department of Obstetrics and Gynecology, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea
3. Department of Pathology, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea