1. Department of Neurosurgery, University of Virginia Health Science Center, Charlottesville
2. Department of Neurology, University of Virginia Health Science Center, Charlottesville
3. Department of Physical Therapy, University of Virginia Health Science Center, Charlottesville
4. Department of Public Health Sciences, University of Virginia Health Science Center, Charlottesville
5. Department of Neurosurgery, Swedish Neuroscience Institute, Seattle, Washington
6. Department of Neurology, Swedish Neuroscience Institute, Seattle, Washington