1. Department of Pediatrics, Ajou University School of Medicine, Suwon, Korea.
2. Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Psychiatry and Behavioral Sciences, Ajou University School of Medicine, Suwon, Korea.
4. Department of Pediatrics, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.
5. Department of Pediatrics, Inha University Hospital, Inha University College of Medicine, Incheon, Korea.
6. Department of Pediatrics, Soonchunhyang University Bucheon Hospital, Soonchunhyang University School of Medicine, Bucheon, Korea.
7. Department of Pediatrics, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, Korea.
8. Department of Pediatrics, Kyung Hee University School of Medicine, Seoul, Korea.
9. Department of Pediatrics, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea.
10. Department of Pediatrics, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
11. Department of Pediatrics, Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea.
12. Hallym University Dongtan Sacred Heart Hospital, Hwaseong, Korea.
13. Department of Pediatrics, Seoul Medical Center, Seoul, Korea.
14. Department of Pediatrics, Jangs Hospital, Seoul, Korea.
15. Department of Pediatrics, National Health Insurance Service, Ilsan Hospital, Goyang, Korea.