1. Department of Physiology, University of Kentucky College of Medicine, Lexington, KY 40536, USA
2. Spinal Cord and Brain Injury Research Center (SCoBIRC), University of Kentucky, Lexington, KY 40536, USA
3. Veterans Affairs Medical Center, Lexington, KY 40502, USA
4. Department of Center for Biotechnology and Genomic Medicine, Augusta University, Augusta, GA 30912, USA