Affiliation: | (1) Department of Pediatrics, Seoul National University College of Medicine, 28 Yongondong, Jongrogu, Seoul, 110-744, Korea;(2) Department of Pathology, Seoul National University College of Medicine, 28 Yongondong, Jongrogu, Seoul, Korea;(3) Department of Radiology, Seoul National University College of Medicine, 28 Yongondong, Jongrogu, Seoul, Korea |