1. Kentucky Spinal Cord Injury Research Center, Departments of University of Louisville, Louisville, Kentucky, USA.
2. Neurological Surgery, University of Louisville, Louisville, Kentucky, USA.
3. Department of Mechanical Engineering, Northern Arizona University, Flagstaff, Arizona, USA.
4. Department of Mechanical Engineering, Columbia University, New York, New York, USA.
5. Frazier Rehabilitation Institute, University of Louisville Health, Louisville, Kentucky, USA.
6. Bioengineering, University of Louisville, Louisville, Kentucky, USA.
7. Kessler Foundation, West Orange, New Jersey, USA.
8. Department of Physical Medicine and Rehabilitation, Rutgers New Jersey Medical School, Newark, New Jersey, USA.
9. Department of Rehabilitation and Regenerative Medicine, Columbia University, New York, New York, USA.
10. Department of Medicine, University of Udine, Udine, Italy.