1. Department of Neurosurgery (H.A.Z., P.K.T., D.M., A.D., G.T., J.S., T.C., H.A.C., S.B.), University of Texas McGovern Medical School, Houston.
2. Department of Internal Medicine (W.L.), University of Texas McGovern Medical School, Houston.
3. Clinical Innovation and Research Institute, Memorial Hermann Hospital, Houston, TX (J.G.).
4. Department of Neurobiology and Anatomy (P.D.), University of Texas McGovern Medical School, Houston.