Affiliation: | 1. Department of Radiology, Seoul National University College of Medicine, 28 Yongon-dong, Chongno-gu, Seoul, 110-744, Korea;2. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, 28 Yongon-dong, Chongno-gu, Seoul, 110-744, Korea;3. Institute of Radiation Medicine, Seoul National University Medical Research Center, 28 Yongon-dong, Chongno-gu, Seoul, 110-744, Korea;4. Clinical Research Institute, Seoul National University Hospital, 28 Yongon-dong, Chongno-gu, Seoul, 110-744, Korea |