1. Department of Pediatrics, Hallym University, Dongtan Sacred Heart Hospital, Hwaseong, Korea.
2. Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Pediatrics, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine, Bucheon, Korea.
4. Department of Pediatrics, Childhood Asthma Atopy Center, Humidifier Disinfectant Health Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
5. Department of Pediatrics, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, Korea.
6. Department of Pediatrics, Kosin University Gospel Hospital, Kosin University School of Medicine, Busan, Korea.
7. Department of Pediatrics, Yonsei University Wonju College of Medicine, Wonju, Korea.
8. Department of Pediatrics, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.
9. Department of Pediatrics, Medical Research Institute, Pusan National University School of Medicine, Pusan National University Hospital, Busan, Korea.
10. Department of Pediatrics, Ajou University School of Medicine, Suwon, Korea.
11. Department of Pediatrics, Busan St. Mary’s Hospital, Busan, Korea.
12. Department of Pediatrics, Chungnam National University Sejong Hospital, Chungnam National University College of Medicine, Sejong, Korea.
13. Department of Pediatrics, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea.
14. Department of Pediatrics, Hallym University Chuncheon Sacred Heart Hospital, Chuncheon, Korea.
15. Department of Pediatrics, Seoul Medical Center, Seoul, Korea.
16. Department of Pediatrics, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
17. Department of Pediatrics, CHA Ilsan Hospital, CHA University School of Medicine, Goyang, Korea.
18. Department of Pediatrics, Inha University Hospital, College of Medicine, Inha University, Incheon, Korea.