1. Department of Neurosurgery, West Virginia University School of Medicine, Morgantown, West Virginia.
2. The Center for Neuroscience, West Virginia University School of Medicine, Morgantown, West Virginia.
3. Department of Basic Pharmaceutical Sciences, West Virginia University School of Medicine, Morgantown, West Virginia.
4. Department of Neurosurgery, NorthShore University Health System, University of Chicago Pritzker School of Medicine, Evanston, Illinois.