1. Division of Pulmonary, Critical Care and Allergy, Department of Internal Medicine Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea Seoul Republic of Korea
2. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine Bucheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea Seoul Republic of Korea
3. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine Incheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea Seoul Republic of Korea
4. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea Seoul Republic of Korea
5. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine St. Vincent's Hospital, College of Medicine, The Catholic University of Korea Seoul Republic of Korea
6. Division of Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine Uijeongbu St. Mary's Hospital, College of Medicine, The Catholic University of Korea Seoul Republic of Korea
7. Division of Pulmonology, Department of Internal Medicine Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea Seoul Republic of Korea
8. Postech‐Catholic Biomedical Engineering Institute Songeui Multiplex Hall, College of Medicine, The Catholic University of Korea Seoul Republic of Korea