1. Departments of Neurology and NeurosurgeryDell Medical School, University of Texas at AustinAustin TX
2. Departments of Radiology and NeurosurgeryUCLALos Angeles CA
3. Delray Medical Center/Tenet South FloridaDelray Beach FL
4. Brigham and Women's HospitalBoston MA
5. Methodist HospitalHouston TX
6. Department of NeurologyUCLALos Angeles CA
7. University of South CaliforniaLos Angeles CA
8. Florida HospitalOrlando FL
9. University of Miami/Jackson Memorial HospitalMiami FL
10. Norton Neuroscience InstituteLouisville KY
11. Emory University School of Medicine/Grady Memorial HospitalAtlanta GA
12. University of Pittsburgh Medical CenterPittsburgh PA
13. Vanderbilt University, Medical CenterNashville TN
14. Mercy St. Vincent HospitalToledo OH