1. Department of Pediatrics, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea
2. Department of Pediatrics, Seoul National University College of Medicine, Seoul, Korea
3. Department of Pediatrics, Seoul Medical Center, Seoul, Korea
4. Department of Pediatrics, Hongseong Medical Center, Hongseong, Korea
5. Department of Pediatrics, Seongnam Citizens Medical Center, Seongnam, Korea
6. Department of Pediatrics, Gyeonggi Provincial Medical Center Ansung Hospital, Ansung, Korea
7. Department of Pediatrics, Seonam Hospital, Seoul, Korea
8. Department of Pediatrics, Gyeonggi Provincial Medical Center Icheon Hospital, Icheon, Korea
9. Department of Pediatrics, Dankook University Hospital, Cheonan, Korea
10. Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
11. Department of Pediatrics, Masan Medical Center, Changwon, Korea
12. Department of Pediatrics, Chung-Ang University Hospital, Seoul, Korea
13. Department of Pediatrics, Busan Medical Center, Busan, Korea
14. Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, Korea
15. Department of Pediatrics, Chungnam National University Hospital, Daejeon, Korea
16. Department of Pediatrics, Inha University Hospital, Incheon, Korea
17. Department of Pediatrics, Myongji Hospital, Goyang, Korea
18. Department of Pediatrics, Pusan National University Hospital, Busan, Korea
19. Department of Pediatrics, Pusan National University Children’s Hospital, Yangsan, Korea
20. Department of Pediatrics, Chungbuk National University Hospital, Cheongju, Korea
21. Department of Pediatrics, Jeonbuk National University Medical School, Jeonju, Korea
22. Department of Pediatrics, Dongguk University College of Medicine, Gyeongju, Korea
23. Department of Pediatrics, Jeju National University Hospital, Jeju, Korea
24. Department of Social and Preventive Medicine, Hallym University College of Medicine, Chuncheon, Korea
25. Department of Pediatrics, Incheon St Mary's Hospital, The Catholic University of Korea, Incheon, Korea
26. Department of Pediatrics, St Vincent's Hospital, The Catholic University of Korea, Suwon, Korea