1. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Allergy TF, Department of Immunology and Pathology, Korea National Institute of Health, Cheongwon, Korea.
4. Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea.
5. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
6. Department of Pediatrics, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Suwon, Korea.
7. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
8. Department of Pediatrics, Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea.
9. Department of Pediatrics, Sungkyunkwan University School of Medicine, Seoul, Korea.
10. Department of Pediatrics, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
11. Department of Pediatrics, Korea Cancer Center Hospital, Seoul, Korea.
12. Department of Pediatrics, Hae-undae Paik Hospital, Inje University College of Medicine, Busan, Korea.
13. Department of Pediatrics, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
14. Department of Pediatrics, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea.
15. Department of Internal Medicine, Soonchunhyang University College of Medicine, Seoul, Korea.
16. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
17. Department of Pediatrics, Childhood Asthma Atopy Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.