1Department of Medicine, Ajou University Intermediate Care Hospital, Suwon, Korea
2Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Inje University Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea
3Department of Pulmonary and Critical Care Medicine, Kyung Hee University Hospital at Gangdong, Seoul, Korea
4Department of Pulmonology, Ewha Womans University Seoul Hospital, Seoul, Korea
5Department of Emergency Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
6Intensive Care Nursing Team, Asan Medical Center, Seoul, Korea
7Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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