1 Emory Critical Care Center (ECCC); Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, Department of Medicine, Emory University School of Medicine; and Department of Epidemiology, Emory University Rollins School of Public Health, Atlanta, GA.
2 Emory Critical Care Center (ECCC); and Department of Anesthesiology, Emory University School of Medicine, Atlanta, GA.