1. 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
2. Division of Pulmonary, Allergy 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, Daejeon 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 Chungnam National University Hospital Daejeon Republic of Korea
5. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Uijeongbu St. Mary's Hospital, College of Medicine The Catholic University of Korea Seoul Republic of Korea
6. Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine, Korea University Guro Hospital Korea University College of Medicine Seoul Republic of Korea
7. Division of Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, Eunpyeong St. Mary's Hospital, College of Medicine The Catholic University of Korea Seoul Republic of Korea
8. Division of Pulmonology, Department of Internal Medicine, St. Vincent's Hospital, College of Medicine The Catholic University of Korea Seoul Republic of Korea
9. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine Chungbuk National University Hospital Cheongju Republic of Korea
10. Department of Pulmonary and Critical Care Medicine, Soonchunhyang University Cheonan Hospital Soonchunhyang University College of Medicine Cheonan Republic of Korea
11. Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine, Kangdong Sacred Heart Hospital Hallym University College of Medicine Seoul Republic of Korea
12. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Konyang University Hospital Konyang University College of Medicine Daejeon Korea
13. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine Dongguk University Ilsan Hospital Goyang Republic of Korea
14. Division of Allergy and Respiratory Medicine, Soonchunhyang University Bucheon Hospital Soonchunhyang University College of Medicine Bucheon Republic of Korea
15. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Ilsan Paik Hospital Inje University College of Medicine Goyang Republic of Korea
16. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Ulsan University Hospital Ulsan University College of Medicine Ulsan Republic of Korea
17. Division of Pulmonology, Department of Internal Medicine Gachon University Gil Hospital Incheon Republic of Korea
18. Division of Pulmonology, Department of Internal Medicine Dankook University College of Medicine Cheonan Republic of Korea
19. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul St. Mary's Hospital, College of Medicine The Catholic University of Korea Seoul Republic of Korea