[1] Univ Cincinnati, Coll Med, Dept Neurosurg, Cincinnati, OH 45267 USA
[2] UC Neurosci Inst, Brain Tumor Ctr, Cincinnati, OH USA
[3] Georgetown Univ, Dept Neurosurg, Washington, DC USA
[4] Univ Cincinnati, Coll Med, Dept Otolaryngol Head & Neck Surg, Cincinnati, OH USA
[5] Univ Calif San Francisco, Dept Neurol Surg, San Francisco, CA USA
[6] Mayfield Clin, Cincinnati, OH USA