1 From the Department of Preventive Medicine and Biostatistics (K.A.S.), Uniformed Services University of the Health Sciences, Bethesda, MD; and Department of Neurology (A.L.C.S.), Division of Neurocritical Care, University of Pennsylvania Perelman School of Medicine, Philadelphia. karen.schwab@usuhs.edu.
2 From the Department of Preventive Medicine and Biostatistics (K.A.S.), Uniformed Services University of the Health Sciences, Bethesda, MD; and Department of Neurology (A.L.C.S.), Division of Neurocritical Care, University of Pennsylvania Perelman School of Medicine, Philadelphia.