1. Department of Obstetrics and Gynecology, Ilsin Christian Hospital, Busan, Korea.
2. Department of Radiological Science, College of Health Sciences, Catholic University of Pusan, Busan, Korea.
3. Department of Radiology, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
4. Department of Radiology, Inje University Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea.