1. Kentucky Spinal Cord Injury Research Center and Departments of University of Louisville School of Medicine, Louisville, Kentucky, USA.
2. Neurological Surgery, University of Louisville School of Medicine, Louisville, Kentucky, USA.
3. Department of Health Management and Systems Science, School of Public Health and Information Sciences, Louisville, Kentucky, USA.
4. Anatomical Sciences and Neurobiology, and University of Louisville School of Medicine, Louisville, Kentucky, USA.
5. Pharmacology and Toxicology, University of Louisville School of Medicine, Louisville, Kentucky, USA.