Affiliation: | 1. Department of Radiology, Cheil General Hospital and Women's Healthcare Center, Sungkyunkwan University School of Medicine, Seoul, Korea;2. Department of Obstetrics and Gynecology, Cheil General Hospital and Women's Healthcare Center, Sungkyunkwan University School of Medicine, Seoul, Korea;3. Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea |