1. Kentucky Spinal Cord Injury Research Center, University of Louisville, Louisville, Kentucky, USA.
2. Department of Neurological Surgery, University of Louisville, Louisville, Kentucky, USA.
3. Graduate Program in Biochemistry and Molecular Genetics, University of Louisville, Louisville, Kentucky, USA.
4. Department of Anatomical Sciences and Neurobiology, University of Louisville, Louisville, Kentucky, USA.
5. Department of Pharmacology and Toxicology, University of Louisville School of Medicine, University of Louisville, Louisville, Kentucky, USA.