[1] Kessler Fdn, Tim & Caroline Reynolds Ctr Spinal Stimulat, 1199 Pleasant Valley Way, West Orange, NJ 07052 USA
[2] Univ Udine, Dept Med, Ple Kolbe 4, I-33100 Udine, UD, Italy
[3] Univ Louisville, Kentucky Spinal Cord Injury Res Ctr, 220 Abraham Flexner Way, Louisville, KY 40202 USA
[4] Univ Verona, Dept Neurosci Biomed & Movement Sci, Verona, Italy
[5] No Arizona Univ, Dept Mech Engn, Biomechatron Lab, S San Francisco St, Flagstaff, AZ 86011 USA
[6] Univ Louisville, Dept Neurol Surg, Louisville, KY 40202 USA
[7] Rutgers New Jersey Med Sch, Dept Phys Med & Rehabil, Newark, NJ 07103 USA
[8] Columbia Univ, Dept Mech Engn, 220 S W Mudd Bldg,500 West 120th St, New York, NY 10027 USA
[9] Columbia Univ, Dept Rehabil & Regenerat Med, New York, NY 10032 USA