1. Division of Allergy, Department of Internal Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Department of Allergy and Clinical Immunology, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea.
3. Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, Korea.
4. Department of Internal Medicine, Chung-Ang University College of Medicine, Gwangmyeong, Korea.
5. Department of Mathematics, College of Natural Sciences, Hanyang University, Seoul, Korea.
6. Division of Pulmonary Medicine and Allergy, Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
7. Department of Internal Medicine, Ewha Woman’s University College of Medicine, Seoul, Korea.
8. Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea.
9. Department of Pulmonary, Allergy and Critical Care Medicine, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea.
10. Department of Internal Medicine, Dong-A University College of Medicine, Busan, Korea.
11. Department of Internal Medicine, Hallym University College of Medicine, Anyang, Korea.
12. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
13. Department of Allergy and Clinical Immunology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
14. Department of Internal Medicine, Kangwon National University School of Medicine, Chuncheon, Korea.
15. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
16. Division of Respiratory Medicine and Allergy, Department of Internal Medicine, Chonbuk National University Medical School, Jeonju, Korea.
17. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
18. Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine, Konkuk University School of Medicine, Seoul, Korea.
19. Department of Medicine, Sungkyunkwan University School of Medicine, Seoul, Korea.