[1] Seoul National University Bundang Hospital,Department of Internal Medicine, Seoul National University College of Medicine, Division of Pulmonary and Critical Care Medicine
[2] Yonsei University College of Medicine,Division of Pulmonology, Department of Internal Medicine, Severance Hospital, Institute of Chest Diseases
[3] University of Ulsan College of Medicine,Division of Pulmonary and Critical Care Medicine
[4] Asan Medical Center,Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine and Lung Institute
[5] Seoul National University College of Medicine,Division of Pulmonary and Critical Care Medicine, Samsung Medical Center
[6] Sungkyunkwan University School of Medicine,Division of Allergy and Respiratory Medicine, Department of Internal Medicine
[7] Soonchunhyang University Seoul Hospital,Division of Allergy and Respiratory Medicine, Department of Internal Medicine
[8] Soonchunhyang University Bucheon Hospital,Division of Pulmonology, Department of Internal Medicine
[9] Gachon University Gil Medical Center,Division of Pulmonary, Allergy & Critical Care Medicine, Department of Internal Medicine
[10] Hallym University Kangdong Sacred Heart Hospital,Pulmonary Division, Department of Internal Medicine
[11] Inha University Hospital,Division of Pulmonary Medicine, Department of Internal medicine
[12] Chung Ang University College of Medicine,Division of Respiratory and Critical Care Medicine, Department of Internal Medicine
[13] Korea University Anam Hospital,Department of Internal Medicine
[14] Korea University College of Medicine,Division of Pulmonary Medicine, Department of Internal Medicine
[15] Ewha Womans University School of Medicine,Division of Critical Care and Pulmonary Medicine, Department of Internal Medicine
[16] Ewha Medical Research Institute,Division of Allergy and Pulmonology, Department of Internal Medicine
[17] Ulsan University Hospital,undefined
[18] University of Ulsan College of Medicine,undefined
[19] Inje University Pusan Paik Hospital,undefined
[20] Bucheon St. Mary’s Hospital,undefined
[21] The Catholic University of Korea School of Medicine,undefined