1Department of Critical Care Medicine, Sungkyunkwan University School of Medicine, Seoul, Korea
2Division of Pulmonary and Critical Care Medicine, Department of Medicine, Sungkyunkwan University School of Medicine, Seoul, Korea
3Department of Thoracic and Cardiovascular Surgery, Sungkyunkwan University School of Medicine, Seoul, Korea
4Division of Cardiology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
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