1. Department of Pulmonary and Critical Care Medicine, Asan Medical Center University of Ulsan College of Medicine Seoul South Korea
2. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Chonnam National University Hwasun Hospital Chonnam National University Medical School Hwasun South Korea
3. Department of Pulmonary Medicine Konkuk University School of Medicine Seoul South Korea
4. Division of Pulmonary, Allergy, and Critical Care Medicine Korea University College of Medicine Seoul South Korea
5. Department of Internal Medicine, School of Medicine Kyungpook National University Daegu South Korea
6. Department of Internal Medicine Pusan National University School of Medicine Busan South Korea
7. Department of Internal Medicine, Chungnam National University Hospital Chungnam National University School of Medicine Daejeon South Korea
8. Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine Hallym University Sacred Heart Hospital Anyang South Korea
9. Department of Internal Medicine Kosin University Gospel Hospital Busan South Korea
10. Department of Oncology, Asan Medical Center University of Ulsan College of Medicine Seoul South Korea