1. Department of Pediatrics, Hallym University Dongtan Sacred Heart Hospital, Hwaseong, Korea.
2. Department of Pediatrics, The Catholic University of Korea Uijeongbu St. Mary's Hospital, Uijeongbu, Korea.
3. Department of Pediatrics, Konkuk University School of Medicine, Seoul, Korea.
4. Department of Pediatrics, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea.
5. Department of Pediatrics, Pusan National University School of Medicine, Yangsan, Korea.
6. Department of Pediatrics, Seoul Medical Center, Seoul, Korea.
7. Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
8. Department of Pediatrics, Soonchunhyang University Hospital, Seoul, Korea.
9. Department of Pediatrics, Ajou University School of Medicine, Suwon, Korea.
10. Department of Pediatrics, Yonsei University College of Medicine, Seoul, Korea.
11. Department of Pediatrics, Yonsei University Wonju College of Medicine, Wonju, Korea.
12. Department of Pediatrics, Childhood Asthma Atopy Center, Environmental Health Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
13. Department of Pediatrics, Inje University Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea.
14. Department of Pediatrics, Inje University Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.
15. Department of Pediatrics, Inha University Hospital, Incheon, Korea.
16. Department of Pediatrics, Hallym University Kangnam Sacred Heart Hospital, Seoul, Korea.