[1] Washington Univ, Dept Neurol, St Louis, MO USA
[2] Univ Michigan, Dept Neurol, Ann Arbor, MI USA
[3] Univ Michigan, Dept Neurosurg, Ann Arbor, MI 48109 USA
[4] Stanford Univ, Sch Med, Dept Neurol & Neurol Sci, Stanford, CA 94305 USA
[5] Northwestern Univ, Dept Neurol, Feinberg Sch Med, Chicago, IL 60611 USA
[6] Northwestern Univ, Dept Anesthesiol, Feinberg Sch Med, Chicago, IL 60611 USA
[7] Duke Univ, Med Ctr, Dept Neurol, Durham, NC USA
[8] Duke Univ, Med Ctr, Dept Anesthesiol, Durham, NC 27710 USA
[9] Vanderbilt Univ, Med Ctr, Dept Anesthesiol, Nashville, TN USA
[10] Vanderbilt Univ, Med Ctr, Dept Crit Care Med, Nashville, TN USA
[11] Univ Texas Southwestern, Dept Neurol Surg, Dallas, TX USA
[12] Univ Texas Southwestern, Dept Neurol, Dallas, TX USA
[13] Univ Texas Southwestern, Dept Anesthesia & Pain Management, Dallas, TX USA
[14] Univ Chicago, Dept Neurol Neurosurg, Chicago, IL 60637 USA
[15] Univ Chicago, Dept Surg Neurosurg, Chicago, IL 60637 USA