1. Division of Pulmonology and Critical Care Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, South Korea
2. Department of Laboratory Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, South Korea
3. Department of Pulmonary, Allergy, and Critical Care Medicine, Hallym University Dongtan Sacred Heart Hospital, Hwaseong-si, South Korea
4. Department of Infectious Diseases, University of Ulsan College of Medicine, Asan Medical Center, Seoul, South Korea