1. Louis Stokes Cleveland Department of Veterans Affairs Medical Center, Cleveland, Ohio, USA
2. Department of Physical Medicine and Rehabilitation, MetroHealth Medical System, Cleveland, Ohio, USA
3. Cleveland VA Functional Electrical Stimulation Center, Cleveland, Ohio, USA
4. Department of Neurosurgery, Stanford University, Stanford, California, USA
5. Spinal Cord Injury Service, VA Palo Alto Health Care System, Palo Alto, California, USA
6. Department of Mathematics and Statistics, Case Western Reserve University, Cleveland, Ohio, USA
7. Department of Physical Medicine & Rehabilitation, Case Western Reserve University, Cleveland, Ohio, USA
8. Ohio University Heritage College of Osteopathic Medicine, Athens, Ohio, USA
9. Departments of Biomedical Engineering and Urology, Case Western Reserve University, Cleveland, Ohio, USA