1. The Miami Project to Cure Paralysis, Miller School of Medicine, University of Miami, Miami, Florida.
2. Department of Neurological Surgery, Miller School of Medicine, University of Miami, Miami, Florida.
3. Department of Physical Medicine and Rehabilitation, Miller School of Medicine, University of Miami, Miami, Florida.
4. Research Service, Bruce W. Carter Department of Veterans Affairs Medical Center, Miami, Florida.
5. Department of Physiology and Biophysics, Miller School of Medicine, University of Miami, Miami, Florida.