1. Department of Pediatrics, Pusan National University Children's Hospital, Yangsan, Korea.
2. Department of Pathology, Seoul National University College of Medicine, Seoul, Korea.
3. The Institute of Kidney disease, Pediatrics, Yonsei University Severance Children's Hospital, Seoul, Korea.
4. The Institute of Kidney Disease, Pathology, Yonsei University College of Medicine, Seoul, Korea.