1. Department of Pediatrics, Childhood Asthma Atopy Center, Environmental Health Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2. Department of Pediatrics, Seoul National University Hospital, Seoul, Korea.
3. Department of Pediatrics, International St. Mary's Hospital, Catholic Kwandong University Hospital, Incheon, Korea.
4. Department of Pediatrics, Hallym University Sacred Heart Hospital, Anyang, Korea.
5. Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, Korea.
6. Department of Pediatrics, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
7. Department of Pediatrics, Gachon University Gil Medical Center, Incheon, Korea.
8. Department of Pediatrics, College of Medicine, Chungbuk National University, Cheongju, Korea.
9. Department of Pediatrics, The Catholic University of Korea College of Medicine, Daejeon, Korea.
10. Department of Pediatrics, Presbyterian Medical Center, Jeonju, Korea.
11. Department of Pediatrics, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea.
12. Department of Pediatrics, Gwangju Veterans Hospital, Gwangju, Korea.
13. Department of Pediatrics, Catholic University of Daegu School of Medicine, Daegu, Korea.
14. Department of Pediatrics, Ulsan University Hospital, Ulsan, Korea.
15. Department of Pediatrics, Pusan National University Yangsan Hospital, Yangsan, Korea.
16. Department of Pediatrics, Dong-A University College of Medicine, Busan, Korea.
17. Department of Pediatrics, Health Science Institute, Gyeongsang National University College of Medicine, Jinju, Korea.