1. Department of Neurology, Neurorehabilitation and Research Program, Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA,
2. Spinal Cord Injury Center, Balgrist University Hospital, Zurich, Switzerland, and ICORD and Division of Neurology, the University of British Columbia, Vancouver, British Columbia, Canada
3. Neurological Surgery and the Miami Project to Cure Paralysis, Miller School of Medicine, Miami, FL