1. Department of Neurological Surgery, University of California Irvine, Orange, California, United States
2. University of Arizona, College of Medicine, Tucson, Arizona, United States
3. Department of Neurological Surgery, Carondelet Neurological Institute, St. Joseph's Hospital, Tucson, Arizona, United States
4. Department of Neurosurgery, University of California Los Angeles, Los Angeles, California, United States
5. College of Arts and Science, Syracuse University, Syracuse, New York, United States