1. Department of Neurology, University of Texas Southwestern Medical Center, Dallas, Texas.
2. Center for Neuroscience and Regenerative Medicine, Department of Neurology, Uniformed Services University of the Health Sciences, Bethesda, Maryland.
3. Department of Rehabilitation Medicine, Mt. Sinai School of Medicine, New York, New York.
4. Department of Physical Medicine and Rehabilitation, Indiana University School of Medicine, Indianapolis, Indiana.