1. Frazier Rehabilitation Institute, UofL Health, Louisville, KY 40202, USA
2. Department of Neurosurgery, University of Louisville, Louisville, KY 40202, USA
3. Kentucky Spinal Cord Injury Research Center, Louisville, KY 40202, USA
4. Kosair Charities Center for Pediatric NeuroRecovery, Louisville, KY 40202, USA