1. Department of Neurosurgery, University of Minnesota, Minneapolis, Minnesota.
2. Department of Surgery, Division of Neurosurgery, Minneapolis VA Health Care System, Minneapolis, Minnesota.
3. Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota.
4. International Collaboration on Repair Discoveries; Division of Physical Medicine and Rehabilitation, University of British Columbia, Vancouver, British Columbia, Canada.
5. Departments of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.
6. Department of Neurosurgery, Hennepin County Medical Center, Minneapolis, Minnesota.