[1] NYU Langone, Grad Med Educ, Div Neurol, New York, NY USA
[2] Univ Hlth Network, Toronto Rehabil Inst, Toronto, ON, Canada
[3] Univ Cambridge, Dept Acad Neurosurg, Cambridge, England
[4] Univ Toronto, Dept Surg, Div Neurosurg, Toronto, ON, Canada
[5] Univ Hlth Network, Toronto Western Hosp, Div Neurosurg, Spinal Program, Toronto, ON, Canada
[6] Univ Toronto, Dept Med, Internal Med Resident, Toronto, ON, Canada
[7] Univ Calif Davis, Spine Neurosurg, Davis, CA USA
[8] Thomas Jefferson Univ, Dept Neurol, Philadelphia, PA 19107 USA
[9] Thomas Jefferson Univ, Dept Orthoped Surg, Philadelphia, PA 19107 USA
[10] Univ Miami, Miami Project Cure Paralysis, Miami, FL USA
[11] Univ British Columbia, Dept Orthopaed, Vancouver, WA USA
[12] McMaster Univ, Dept Family Med, Hamilton, ON, Canada