1. Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, Maryland, USA.
2. Department of Neurosurgery, Walter Reed National Military Medical Center, Bethesda, Maryland, USA.
3. Division of Neurosurgery, Connecticut Children's, Hartford, Connecticut, USA.
4. Department of Neurosurgery, Jefferson Medical College, Philadelphia, Pennsylvania, USA.
5. Division of Neurosurgery and Spine Program, University of Toronto, Toronto, Ontario, Canada.
6. Department of Neurosurgery, University of Texas, Houston at Methodist Hospital, Houston, Texas, USA.
7. Department of Neurological Surgery, the Miami Project to Cure Paralysis, Miami, Florida, USA.
8. Department of Neurosurgery, Kentucky Spinal Cord Injury Research Center, Louisville, Kentucky, USA.
9. School of Nursing and Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada.
10. Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.