1. Department of Emergency Medicine, Orlando Regional Medical Center, Orlando, Florida, USA.
2. Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada.
3. Department of Neurology, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
4. Department of Kinesiology, Pennsylvania State University, University Park, Pennsylvania, USA.
5. Department of Radiology, University of Texas Southwestern Medical Center, Dallas, Texas, USA.