1Department of Critical Care Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
2Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
3Department of Pulmonary, Allergy and Critical Care Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea
4Division of Respiratory and Critical Care Medicine, Department of Internal Medicine, Yeungnam University Medical Center, Daegu, Korea
5Division of Pulmonary and Critical Care Medicine, Department of Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
6Department of Internal Medicine, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, Korea
7Department of Internal Medicine, Kangwon National University Hospital, Chuncheon, Korea
8Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Inje University Sanggye Paik Hospital, Seoul, Korea
9Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine, Kyung Hee University Hospital, Seoul, Korea
10Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea
11Department of Medicine, Keimyung University Dongsan Medical Center, Daegu, Korea
12Department of Internal Medicine, Daegu Catholic University Medical Center, Daegu Catholic University College of Medicine, Daegu, Korea
13Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Korea
14Department of Anesthesiology, Chonnam National University Hospital, Gwangju, Korea
15Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea
16Department of Internal Medicine, Research Center for Pulmonary Disorders, Chonbuk National University Medical School, Jeonju, Korea
17Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Inje University Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea
18Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
19Division of Pulmonology, Department of Internal Medicine, Korea University Ansan Hospital, Ansan, Korea
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