1. Division of Allergy and Immunology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
2. Institute of Allergy, Yonsei University College of Medicine, Seoul, Korea.
3. Division of Allergy, Asthma, and Clinical Immunology; Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea.
4. Air Care Advanced R&D, Home Appliance & Air Solution Company, LG Electronics, Seoul, Korea.
5. Biostatistics Collaboration Unit, Department of Biomedical Systems Informatics, Yonsei University College of Medicine, Seoul, Korea.