1Department of Pulmonology and Critical Care Medicine, Chosun University Hospital, Gwangju, Korea
2Division of Respiratory and Critical Care Medicine, Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea
3Department of Internal Medicine, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea
4Division of Allergy and Pulmonology, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
5Division of Allergy and Respiratory Diseases, Soonchunhyang University Hospital, Seoul, Korea
6Department of Internal Medicine, Jeju National University College of Medicine, Jeju, Korea
7Department of Pulmonary and Critical Care Medicine, Chungnam National University Hospital, Daejeon, Korea
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