[1] Cleveland Clin Fdn, Brain Tumor Inst, Dept Neurol Surg, Cleveland, OH 44195 USA
[2] Cleveland Clin Fdn, Dept Otolaryngol & Communicat Disorders, Cleveland, OH 44195 USA
[3] Cleveland Clin Fdn, Dept Neurosurg, Cleveland, OH 44195 USA
[4] Cleveland Clin Fdn, Dept Anat Pathol, Cleveland, OH 44195 USA
[5] Cleveland Clin Fdn, Dept Orthopaed Surg, Cleveland, OH 44195 USA