1. Department of Internal Medicine; Seoul National University College of Medicine; Seoul Korea
2. Upper Airways Research Laboratory; Department of Otorhinolaryngology; Ghent University; Ghent Belgium
3. Department of Internal Medicine; Pusan National University School of Medicine; Pusan Korea
4. Department of Internal Medicine; SMG-SNU Boramae Medical Center; Seoul Korea
5. Department of Internal Medicine; Seoul National University Bundang Hospital; Seongnam Korea
6. Department of Internal Medicine; Chosun University Medical School; Gwangju Korea
7. Department of Allergy and Clinical Immunology; Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea
8. Department of Internal Medicine; Hanyang University College of Medicine; Seoul Korea
9. Department of Internal Medicine; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Korea
10. Department of Internal Medicine; Dankook University College of Medicine; Cheonan Korea
11. Department of Internal Medicine; Chung-Ang University College of Medicine; Seoul Korea