[1] Kaohsiung Med Univ Hosp, Dept Neurosurg, Kaohsiung 807, Taiwan
[2] Kaohsiung Med Univ, Grad Inst Med, Coll Med, Fac Med, Kaohsiung 807, Taiwan
[3] Tulane Univ, Dept Neurosurg, New Orleans, LA 70112 USA
[4] Loma Linda Univ, Sch Med, Dept Neurosurg, Loma Linda, CA 92354 USA
[5] Loma Linda Univ, Sch Med, Dept Physiol, Loma Linda, CA 92354 USA
[6] Loma Linda Univ, Sch Med, Dept Anesthesiol, Loma Linda, CA 92354 USA
[7] Univ Cincinnati, Dept Neurosurg, Cincinnati, OH 45219 USA
[8] Univ Zurich Hosp, Dept Neurosurg, Neurocrit Care Unit, CH-8091 Zurich, Switzerland
[9] Kantonsspital Aarau, Dept Neurosurg, CH-5001 Aarau, Switzerland