1. 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
2. Division of Pulmonology, Department of Internal Medicine College of Medicine, Chungnam National University Daejeon Republic of Korea
3. Department of Pulmonary and Critical Care Medicine Asan Medical Center, University of Ulsan College of Medicine Seoul Republic of Korea
4. Department of Internal Medicine Chonnam National University Medical School and Hwasun Hospital Hwasun Republic of Korea
5. Department of Pulmonary Medicine Konkuk University School of Medicine Seoul Republic of Korea
6. Department of Internal Medicine Kosin University Medical College Pusan Republic of Korea
7. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine Kyung Hee University Medical Center, Kyung Hee University College of Medicine Seoul Republic of Korea
8. Division of Pulmonology, Department of Internal Medicine Severance Hospital, Yonsei University College of Medicine Seoul Republic of Korea
9. Department of Internal Medicine Hanyang University Hospital Hanyang University College of Medicine Seoul Republic of Korea
10. Division of Pulmonology, Respiratory Center Keimyung University Dongsan Hospital, Keimyung University School of Medicine Daegu Republic of Korea