1. Department of Biomedical Sciences of Cells and Systems and University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
2. Department of Rehabilitation Medicine, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
3. The Miami Project to Cure Paralysis, University of Miami Miller School of Medicine, Miami, Florida, USA.
4. Department of Physiology and Biophysics and University of Miami Miller School of Medicine, Miami, Florida, USA.
5. Department of Neurological Surgery, University of Miami Miller School of Medicine, Miami, Florida, USA.