[1] Univ Louisville, Outcomes Res TM Inst, Dept Anesthesiol, Louisville, KY 40292 USA
[2] Univ Louisville, Outcomes Res TM Inst, Dept Perioperat Med, Louisville, KY 40292 USA
[3] Univ Louisville, Outcomes Res TM Inst, Dept Neurosci, Louisville, KY 40292 USA
[4] Univ Louisville, Anesthesia Intens Care Unit, Louisville, KY 40292 USA