1. Department of Pulmonary and Critical Care Medicine Nowon Eulji Medical Center, University of Eulji Seoul South Korea
2. Department of Pulmonary and Critical Care Medicine Chonnam National University Hwasun hospital, Chonnam National University Jeollanam‐do Republic of Korea
3. Department of Internal Medicine Postech‐Catholic Biomedical Engineering Institute, College of Medicine, The Catholic University of Korea Seoul Republic of Korea
4. Department of Pulmonary and Critical Care Medicine Catholic University of Korean Yeouido Saint Mary's Hospital Seoul Korea
5. Department of Internal Medicine Yonsei University College of Medicine, 8th Floor Annex Building, Yongdong Severance Hospital Seoul Republic of Korea
6. Department of Internal Medicine Daegu Catholic University School of Medicine Daegu Korea
7. Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine, Korea University Guro Hospital, Korea University College of Medicine Seoul Korea
8. Division of Pulmonary and Critical Care Medicine Kyungpook National University Chilgok Hospital Daegu Korea
9. Department of Pulmonary and Critical Care Medicine Inha University Hospital Incheon Republic of Korea
10. Department of Internal Medicine Chungnam National University Hospital Daejeon Republic of Korea
11. Department of Pulmonary Medicine Konkuk University School of Medicine Seoul Republic of Korea
12. Department of Internal Medicine Kosin University Medical College Pusan Korea
13. Department of Pulmonary Allergy and Critical Care Medicine, Hallym University Sacred Heart Hospital Anyang Republic of Korea
14. Department of Internal Medicine School of Medicine, Pusan National University Yangsan Republic of Korea
15. Division of Pulmonology, Institute of Chest Disease, Department of Internal Medicine Yonsei University College of Medicine Seoul Republic of Korea
16. Department of Pulmonary and Critical Care Medicine Asan Medical Centre, University of Ulsan College of Medicine Seoul Republic of Korea
17. Department of Oncology Asan Medical Centre, University of Ulsan College of Medicine Seoul Republic of Korea