1. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea.
2. Division of Pulmonary, Allergy and Critical Care Medicine, Chung-Ang University Gwangmyeong Hospital, Gwangmyeong, Korea.
3. Department of Mathematics, College of Natural Sciences, Hanyang University, Seoul, Korea.
4. Division of Pulmonary Medicine and Allergy, Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
5. Department of Allergy and Clinical Immunology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
6. Division of Allergy and Clinical Immunology, Department of Internal Medicine, Ewha University Seoul Hospital, Seoul, Korea.
7. Division of Pulmonary, Department of Internal Medicine, Allergy and Critical Care Medicine, Hallym University Gangdong Sacred Heart Hospital, Seoul, Korea.
8. Division of Pulmonary Medicine, Department of Internal Medicine, Hallym University Sacred Heart Hospital, Hallym University Medical School, Anyang, Korea.
9. Division of Pulmonology, Allergy and Critical Care Medicine, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
10. Division of Allergy and Clinical Immunology, Department of Internal Medicine, Gangwon National University Hospital, Chuncheon, Korea.
11. Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine, Kyung Hee University Hospital, Seoul, Korea.
12. Division of Allergy, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
13. Department of Internal Medicine, Inje University of College of Medicine, Haeundae Paik Hospital, Busan, Korea.
14. Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea.
15. Division of Allergy and Clinical Immunology, Department of Internal Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.
16. Division of Allergy and Clinical Immunology, Department of Internal Medicine, Yonsei University Severance Hospital, Seoul, Korea.
17. Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine, Sunchunhyang University Bucheon Hospital, Bucheon, Korea.
18. Department of Internal Medicine, Research Center for Pulmonary Disorders, Chonbuk National University Medical School, Jeonju, Korea.
19. Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine, Ulsan University Hospital, Ulsan, Korea.
20. Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine, Catholic University St. Mary’s Hospital, Seoul, Korea.
21. Division of Allergy and Clinical Immunology, Department of Internal Medicine, Seoul National University, Seoul, Korea.
22. Department of Internal Medicine, Eulji University College of Medicine, Seoul, Korea.
23. Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
24. Department of Allergy and Clinical Immunology, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea.
25. Division of Allergy, Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
26. Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, Korea.