1. Department of Pediatrics, Korea University Ansan Hospital, Ansan, Korea.
2. Department of Pediatrics, Gachon University College of Medicine, Incheon, Korea.
3. Department of Pediatrics, Incheon St. Mary's Hospital, The Catholic University of Korea, Incheon, Korea.
4. Department of Pediatrics, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
5. Department of Pediatrics, School of Medicine, Sungkyunkwan University, Seoul, Korea.
6. Department of Pediatrics, Nowon Eulji Medical Center, Eulji University School of Medicine, Seoul, Korea.
7. Department of Pediatrics, Inje University Ilsan Paik Hospital, Goyang, Korea.
8. Department of Pediatrics, Korea Institute of Radiological Medical Sciences, Seoul, Korea.
9. Department of Pediatrics, Chonbuk National University Children's Hospital, Jeonju, Korea.
10. Department of Pediatrics, Yonsei University, Wonju College of Medicine, Wonju, Korea.