1. Department of Anatomy and Neurobiology, University of Kentucky Chandler Medical Center, Lexington, Kentucky.
2. Morris K. Udall Parkinson's Disease Research Center of Excellence, University of Kentucky Chandler Medical Center, Lexington, Kentucky.
3. Center for Microelectrode Technology, University of Kentucky Chandler Medical Center, Lexington, Kentucky.
4. Spinal Cord and Brain Injury Research Center, University of Kentucky Chandler Medical Center, Lexington, Kentucky.
5. Department of Physical Medicine and Rehabilitation, University of Kentucky Chandler Medical Center, Lexington, Kentucky.