[1] Samsung Medical Center,Department of Critical Care Medicine
[2] Sungkyunkwan University School of Medicine,Division of Pulmonary and Critical Care Medicine, Department of Medicine
[3] Samsung Changwon Hospital,Center for Clinical Epidemiology
[4] Sungkyunkwan University School of Medicine,Department of Clinical Research Design and Evaluation, SAIHST
[5] Samsung Medical Center,Department of Epidemiology
[6] Sungkyunkwan University,Department of Preventive Medicine & Public Health
[7] Johns Hopkins University Bloomberg School of Public Heath,Departments of Epidemiology and Medicine, and Welch Center for Prevention, Epidemiology, and Clinical Research
[8] Ajou University School of Medicine,Medical Intensive Care Unit
[9] Institute on Aging,Division of Pulmonary and Critical Care Medicine, Department of Medicine
[10] Ajou University Medical Center,undefined
[11] Johns Hopkins University Bloomberg School of Public Health,undefined
[12] Outpatient Nursing Team,undefined
[13] Samsung Medical Center,undefined
[14] Samsung Medical Center,undefined
[15] Samsung Medical Center,undefined
[16] Sungkyunkwan University School of Medicine,undefined