1. Stroke Center, Department of Neurology, University of California, Los Angeles
2. Department of Emergency Medicine, University of California, Los Angeles
3. Department of Neurology, Stanford University, Stanford, California
4. Department of Emergency Medicine, University of Southern California, Los Angeles
5. Los Angeles Fire Department, Los Angeles, California
6. Department of Emergency Medicine, Harbor-University of California, Los Angeles Medical Center, Los Angeles
7. Los Angeles EMS Agency, Los Angeles, California
8. Orange County EMS Agency, Orange County, California
9. Los Angeles County Department of Public Health, Los Angeles, California
10. National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland
11. Department of Neurology, University of Southern California, Los Angeles