1. Kentucky Spinal Cord Injury Research Center, University of Louisville, Louisville, Kentucky, USA
2. Department of Mechanical Engineering, Columbia University, New York, New York, USA
3. Department of Rehabilitation and Regenerative Medicine, Columbia University, New York, New York, USA
4. Department of Neurological Surgery, University of Louisville, Louisville, Kentucky, USA
5. Frazier Rehabilitation Institute, University of Louisville Health, Louisville, Kentucky, USA
6. Department of Bioengineering, University of Louisville, Louisville, Kentucky, USA