[1] SUNY Buffalo, Sch Med & Biomed Sci, Dept Neurosurg, Buffalo, NY 14260 USA
[2] SUNY Buffalo, Sch Med & Biomed Sci, Toshiba Stroke Res Ctr, Buffalo, NY 14260 USA
[3] Univ Cincinnati, Mayfield Clin, Cincinnati, OH USA
[4] Univ Cincinnati, Dept Neurosurg, Cincinnati, OH USA