1. Department of Neurological Surgery and Kentucky Spinal Cord Injury Research Center, University of Louisville, Kentucky, Louisville, KY, USA
2. Magee Rehabilitation Hospital, Philadelphia, PA, USA
3. Kessler Institute for Rehabilitation, Outpatient Department, West Orange, NJ, USA
4. Kessler Institute for Rehabilitation, West Orange, NJ, USA
5. TIRR Memorial Hermann, Houston, TX, USA
6. University of St. Augustine, Austin, TX, USA