1. Department of Internal Medicine, Seoul St Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Division of Pulmonology and Allergy, Department of Internal Medicine, Gachon University Gil Medical Center, Gachon University College of Medicine, Incheon, Korea.
3. Department of Pediatrics, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Pediatrics, Kyung Hee University Medical Center, Seoul, Korea.
5. Department of Otorhinolaryngology-Head and Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
6. Department of Otorhinolaryngology-Head & Neck Surgery, Kyung Hee University Hospital, Kyung Hee University College of Medicine, Seoul, Korea.
7. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
8. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea.
9. Department of Pediatrics, Soonchunhyang University Gumi Hospital, Gumi, Korea.
10. Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, Korea.
11. Department of Pediatrics, Daejeon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Daejeon, Korea.
12. Department of Pediatrics, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea.
13. Department of Pediatrics, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea.
14. Department of Pediatrics, Chungnam National University School of Medicine, Daejeon, Korea.
15. Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Seoul, Korea.
16. Department of Allergy and Clinical Immunology, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea.
17. Department of Otolaryngology-Head & Neck Surgery, Gachon University Gil Medical Center, Gachon University College of Medicine, Incheon, Korea.
18. Department of Pediatrics, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
19. Jang’s Pediatrics, Seoul, Korea.
20. Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University College of Medicine, Seoul, Korea.
21. Division of Allergy & Clinical Immunology, Department of Internal Medicine, Center for Health Policy Research, Catholic Kwandong University College of Medicine, International St. Mary's Hospital, Incheon, Korea.
22. Department of Pulmonology and Allergy, Hallym University Dongtan Sacred Heart Hospital, Hwaseong, Korea.