1. Department of Pediatrics, Seoul National University Children's Hospital, Seoul, Korea.
2. Department of Pediatrics, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Pediatrics, Chungnam National University School of Medicine, Daejeon, Korea.
4. Department of Pediatrics, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
5. Department of Pediatrics, The Catholic University of Korea College of Medicine, Seoul St. Mary's Hospital, Seoul, Korea.
6. Department of Pediatrics, Yonsei University College of Medicine, Severance Children's Hospital, Seoul, Korea.
7. Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
8. Department of Pediatrics, Eulji University School of Medicine, Eulji University Hospital, Seoul, Korea.
9. Department of Pediatrics, Hanyang University College of Medicine, Seoul, Korea.
10. Department of Pediatrics, Kyung Hee University School of Medicine, Seoul, Korea.
11. Department of Pediatrics, Inha University College of Medicine, Incheon, Korea.
12. Department of Pediatrics, Hallym University College of Medicine, Anyang, Korea.
13. Department of Pediatrics, Inje University Ilsan Paik Hospital, Goyang, Korea.
14. Department of Pediatrics, Korea University Ansan Hospital, Ansan, Korea.
15. Department of Pediatrics, The Catholic University of Korea College of Medicine, St. Vincent's Hospital, Suwon, Korea.
16. Department of Pediatrics, CHA Bundang Medical Center, CHA University, Seongnam, Korea.
17. Department of Pediatrics, Yonsei University Wonju College of Medicine, Wonju, Korea.
18. Department of Pediatrics, Dankook University College of Medicine, Cheonan, Korea.
19. Department of Pediatrics, Keimyung University School of Medicine, Daegu, Korea.
20. Department of Pediatrics, Pusan National University School of Medicine, Busan, Korea.
21. Department of Pediatrics, Kosin University Gospel Hospital, Busan, Korea.
22. Department of Pediatrics, Fatima Hospital, Changwon, Korea.
23. Department of Pediatrics, Chonbuk National University Medical School, Jeonju, Korea.
24. Department of Pediatrics, Chonnam National University, Gwangju, Korea.