[1] Univ Cambridge, Div Neurosurg, Dept Clin Neurosci, Cambridge, England
[2] Myelopathy Org, Cambridge, England
[3] Univ Maryland, Div Neurosurg, Baltimore, MD 21201 USA
[4] Univ British Columbia, Dept Orthopaed, Vancouver, BC, Canada
[5] Med Coll Wisconsin, Dept Neurosurg, Milwaukee, WI 53226 USA
[6] Thomas Jefferson Univ Hosp, Dept Neurosurg, Philadelphia, PA 19107 USA
[7] Toronto Western Hosp, Dept Neurosurg, Toronto, ON, Canada
[8] Houston Methodist Hosp, Dept Neurosurg, Houston, TX 77030 USA
[9] Univ Cambridge, Dept Clin Neurosci, Anne McLaren Lab Regenerat Med, Cambridge, England