1. Department of Pathology, University of Texas Southwestern Medical Center, Dallas, Texas
2. Department of Radiology, Central Texas Veterans Healthcare System, Temple, Texas
3. Department of Radiology, University of Texas Southwestern Medical Center, Dallas, Texas
4. Department of Neurological Surgery, University of Texas Southwestern Medical Center, Dallas, Texas
5. Department of Neurology and Neurotherapeutics, University of Texas Southwestern Medical Center, Dallas, Texas