[1] Univ Rochester, Dept Anesthesiol, Rochester, NY 14642 USA
[2] Univ Rochester, Dept Surg, Rochester, NY 14642 USA
[3] Univ Rochester, Dept Neurosurg, Rochester, NY 14642 USA
[4] Campus Verchow Klinikum Humholt Univ, Charite Univ Median Berlin, Dept Anesthesiol & Operat Intens Care, Berlin, Germany