[1] Johns Hopkins Univ, Sch Med, Dept Anesthesiol & Crit Care Med, Div Neurosci Crit Care, Baltimore, MD USA
[2] Johns Hopkins Univ, Sch Med, Dept Neurol, Baltimore, MD USA
[3] Northeast Georgia Med Ctr, Dept Neurol, Gainesville, GA USA
[4] Johns Hopkins Univ, Sch Med, Dept Neurol, Div Vasc Neurol, Baltimore, MD USA
[5] Johns Hopkins Univ, Sch Med, Dept Neurosurg, Baltimore, MD USA
[6] Johns Hopkins Univ, Sch Med, Dept Anesthesiol & Crit Care Med, Div Neurosci Crit Care, Baltimore, MD 21205 USA
[7] Johns Hopkins Univ, Sch Med, Dept Neurol, Baltimore, MD 21205 USA