[1] Univ Kentucky, Coll Nursing, Lexington, KY 40506 USA
[2] Univ Kentucky, Coll Med, Dept Anesthesiol, Div Crit Care Med, Lexington, KY 40506 USA
[3] Univ Kentucky, Coll Med, Dept Anesthesiol, Lexington, KY USA
[4] Univ Kentucky, Coll Med, Neuroanesthesia, Lexington, KY USA
[5] Univ Kentucky, Coll Med, Dept Neurol Surg, Lexington, KY USA
[6] Univ Kentucky, Coll Med, Dept Neurol, Lexington, KY USA
[7] Univ Kentucky, Coll Med, Dept Radiol, Lexington, KY USA
[8] Univ Kentucky, Coll Med, Dept Neurosci, Lexington, KY USA