1. National Naval Medical Center, Bethesda, Maryland.
2. Neurotrauma Laboratory, Uniformed Services University of the Health Sciences, Bethesda, Maryland.
3. Department of Anatomy, Physiology and Genetics, Uniformed Services University of the Health Sciences, Bethesda, Maryland.
4. Department of Neurosurgery, Walter Reed Army Medical Center, Washington, D.C.
5. Department of Neurology, Uniformed Services University of the Health Sciences, Bethesda, Maryland.