1. Lexington Veterans' Affairs Healthcare System, Lexington, Kentucky, USA.
2. Department of Physiology, University of Kentucky, Lexington, Kentucky, USA.
3. Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington, Kentucky, USA.
4. Department of Neuroscience, University of Kentucky, Lexington, Kentucky, USA.
5. Mitochon Pharmaceuticals, Inc., Blue Bell, Pennsylvania, USA.