1. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea.
2. Division of Pulmonology and Allergy, Department of Internal Medicine, Chungnam National University Sejong Hospital, Sejong, Korea.
3. Department of Internal Medicine, St. Carollo General Hospital, Suncheon, Korea.
4. Division of Pulmonology and Allergy, Department of Internal Medicine, KyungHee University Medical Center, Seoul, Korea.
5. Division of Pulmonology and Allergy, Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea.
6. Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
7. Departmemt of Internal Medicine, Chungbuk National University Hospital, Chungbuk National College of Medicine, Cheongju, Korea.
8. Division of Pulmonary, Allergy, and Critical Care Medicine, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.
9. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
10. Institute for Allergy, Yonsei University College of Medicine, Seoul, Korea.
11. Department of Pediatrics, Seoul National University Hospital, Seoul, Korea.
12. Department of Pediatrics, Seoul National University College of Medicine, Seoul, Korea.
13. Department of Dermatology, Seoul National University College of Medicine, Seoul, Korea.
14. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
15. Department of Allergy and Clinical Immunology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
16. Institute of Allergy and Clinical Immunology, Seoul National University Medical Research Center, Seoul, Korea.
17. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.