1. Imaging Resource Center, University of Kansas Medical Center, Kansas City, Kansas
2. Department of Surgery, Division of Neurosurgery, University of Kansas Medical Center, Kansas City, Kansas
3. Departments of Neurology, University of Kansas Medical Center, Kansas City, Kansas
4. Departments of Radiology, University of Kansas Medical Center, Kansas City, Kansas
5. Departments of Pharmacology, Toxicology and Therapeutics, University of Kansas Medical Center, Kansas City, Kansas