1. Department of Medicine Asan Medical Center, Ulsan University College of Medicine Seoul Korea
2. Department of Pediatrics Childhood Asthma Atopy Center Environmental Health Center Asan Medical Center, University of Ulsan College of Medicine Seoul Korea
3. Department of Pediatrics International St. Mary's Hospital, Catholic Kwandong University Incheon Korea
4. Department of Pediatrics Seoul National University College of Medicine Seoul Korea
5. Department of Pediatrics Hallym University Sacred Heart Hospital Chuncheon‐si Korea
6. Department of Pediatrics Seoul National University Bundang Hospital Seoul Korea
7. Department of Pediatrics National Health Insurance Service Ilsan Hospital Goyang‐si Korea
8. Department of Pediatrics Gachon University Gil Medical Center Incheon Korea
9. Department of Pediatrics Chungbuk National University Hospital and College of Medicine Cheongju Korea
10. Department of Pediatrics The Catholic University of Korea, Daejeon St. Mary's Hospital Daejeon Korea
11. Department of Pediatrics Presbyterian Medical Center Jeonju Korea
12. Department of Pediatrics Chonnam National University Children's Hospital and Medical School Gwangju Korea
13. Department of Pediatrics Gwangju Veterans Hospital Gwangju Korea
14. Department of Pediatrics Catholic University of Daegu School of Medicine Daegu Korea
15. Department of Pediatrics Ulsan University HospitalUniversity of Ulsan College of Medicine Ulsan Korea
16. Department of Pediatrics Pusan National University Yangsan Hospital Yangsan Korea
17. Department of Pediatrics Dong‐A University College of Medicine Busan Korea
18. Department of Pediatrics Institute of Health Sciences Gyeongsang National University College of Medicine Jinju Korea
19. Department of Food and Nutrition Kyunghee University Seoul Korea
20. Biomedical Research Institute Kangwon National University Hospital Chuncheon Korea
21. Division of Allergy and Chronic Respiratory Diseases, Center for Biomedical Sciences Korea National Institute of Health Korea Centers for Disease Control and Prevention Cheongju Korea
22. Korea Institute of Child Care and Education Seoul Korea
23. Department of Medical Science Asan Medical Institute of Convergence Science and Technology Asan Medical Center, Ulsan University College of Medicine Seoul Korea