[1] Univ Cincinnati Med Ctr, UC Neurosci Inst, Dept Emergency Med, Div Neurocrit Care, Cincinnati, OH 45267 USA
[2] Vet Adm Med Ctr, Cincinnati, OH 45220 USA
[3] Univ Cincinnati, Dept Neurol, Cincinnati, OH USA
[4] Univ Cincinnati, Dept Neurosurg, Cincinnati, OH USA
[5] Univ Cincinnati, Dept Emergency Med, Cincinnati, OH USA