1. Samsung Medical Center, , Division of Pulmonary and Critical Care Medicine, Department of Medicine, Seoul, Korea (the Republic of)
2. SAIHST, Sungkyunkwan University, Departments of Health Sciences and Technology and Clinical Research Design and Evaluation, Seoul, Korea (the Republic of)
3. Samsung Medical Center, 36626, Division of Pulmonary and Critical Care Medicine, Department of Medicine, Gangnam-gu, Seoul, Korea (the Republic of)
4. Hallym University College of Medicine, 96664, Chuncheon, Gangwon, Korea (the Republic of)
5. Division of Pulmonary, Allergy and Critical Care Medicine, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea (the Republic of)
6. Seoul National University College of Medicine, 37990, Seoul, Korea (the Republic of)
7. Sungkyunkwan University School of Medicine, Samsung Medical Center, Department oh Medicine, Division of Respiratory and Critical Medicine, Seoul, Korea (the Republic of)
8. Samsung Medical Center, Division of Pulmonary and Critical Care Medicine, Department of Medicine, Seoul, Korea (the Republic of)
9. Catholic university of Korea, Internal medicine, Seoul, Korea (the Republic of)
10. SAIHST, Department of Clinical Research Design and Evaluation, Seoul, Korea (the Republic of);