1 Division of Allergy and Respiratory Diseases, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
2 Department of Environmental Health Sciences, Soonchunhyang University, Asan, Korea.
3 Soonchunhyang Medical Research Institute, Soonchunhyang University College of Medicine, Cheonan, Korea.
4 Division of Allergy and Respiratory Diseases, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea. new1221@naver.com.