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