1. Department of Pediatrics, Seoul National University Children's Hospital, Seoul, Korea.
2. Department of Radiology, Seoul National University Children's Hospital, Seoul, Korea.
3. Department of Pediatrics, Pusan National University Children's Hospital, Yangsan, Korea.
4. Division of Pediatric Urology, Seoul National University Children's Hospital, Seoul, Korea.
5. Department of Pediatrics, Pediatric Clinical Neuroscience Center, Seoul National University Children's Hospital, Seoul, Korea.
6. Kidney Research Institute, Medical Research Center, Seoul National University College of Medicine, Seoul, Korea.