1. Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine Hallym University Kangnam Sacred Heart Hospital Seoul South Korea
2. Lung Research Institute, Hallym University College of Medicine Chuncheon South Korea
3. Department of Emergency Medicine Hallym University Dongtan Sacred Heart Hospital Hwaseong South Korea
4. Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine Hallym University Dongtan Sacred Heart Hospital Hwaseong South Korea
5. Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine Hallym University Sacred Heart Hospital Anyang South Korea
6. Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine Kangdong Sacred Heart Hospital Seoul South Korea
7. Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine Hallym University Chuncheon Sacred Heart Hospital Chuncheon South Korea