1. Department of Pediatrics, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Department of Pediatrics, Inje University Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea.
4. Department of Pediatrics, Inje University Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
5. Department of Pediatrics, Hallym University Secred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.
6. Department of Pediatrics, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
7. Department of Pediatrics, Inje University Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea.
8. Department of Pediatrics, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea.
9. Department of Pediatrics, Kangbuk Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
10. Childhood Asthma Atopy Center, Department of Pediatrics, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
11. Research Center for Standardization of Allergic Diseases, Seoul, Korea.