[1] Johns Hopkins Univ, Dept Anesthesiol & Crit Care Med, Neurol & Neurosurg, Baltimore, MD 21287 USA
[2] Johns Hopkins Univ, Dept Anesthesiol & Crit Care Med, Neurol Neurosurg & Gen Internal Med, Baltimore, MD 21287 USA
[3] Johns Hopkins Univ, Div Brain Injury Outcomes, Dept Neurol, Baltimore, MD 21287 USA