1Department of Pulmonary, Allergy and Critical Care Medicine, Hallym University Kangnam Sacred Heart Hospital, Seoul, Korea
2Department of Pulmonary and Critical Care Medicine, Inha University College of Medicine, Incheon, Korea
3Department of Pulmonary and Critical Care Medicine, Yeungnam University Hospital, Daegu, Korea
4Department of Pulmonary and Critical Care Medicine, Inje University Sanggye Paik Hospital, Seoul, Korea
5Department of Internal Medicine, Myongji Hospital, Goyang, Korea
6Department of Pulmonary and Critical Care Medicine, Kyung Hee University Hospital at Gangdong, Seoul, Korea
7Department of Pulmonary and Critical Care Medicine, Chungnam National University Hospital, Daejeon, Korea
8Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
9Department of Pulmonary, Critical Care and Sleep Medicine, St. Paul’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
10Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea
11Department of Internal Medicine, Hanyang University Guri Hospital, Guri, Korea
12Department of Pulmonary, Allergy and Critical Care Medicine, Jeonbuk National University Hospital, Jeonju, Korea
13Department of Pulmonary, Allergy and Critical Care Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea
14Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
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