1. Department of Pediatrics, Childhood Asthma Atopy Center, Research Center for the Standardization of Allergic Diseases, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
2. Department of Pediatrics, Chonnam National University Hospital, Gwangju, Korea.
3. Department of Pediatrics, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.
4. Department of Pediatrics, Gyeongsang National University Changwon Hospital, Gyeongsang, Korea.
5. Department of Pediatrics, CHA Bundang Medical Center, College of Medicine, CHA University, Seongnam, Korea.
6. Department of Pediatrics, Dankook University Hospital, Cheonan, Korea.
7. Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, Korea.
8. Department of Pediatrics, Inje University Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
9. Department of Pediatrics, Gangneung Asan Hospital, Gangneung, Korea.
10. Department of Pediatrics, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
11. Division of Allergy and Chronic Respiratory Diseases, Center for Biomedical Sciences, Korea National Institute of Health, Korea Center for Disease Control and Prevention, Cheongju, Korea.