1. Molecular and Clinical Sciences Research Institute, St George’s University of London, United Kingdom (A.S., L.R.B., A.C.P., A.H.H.).
2. Wessex Spinal Unit, University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom (A.S.).
3. Department of Cellular Pathology (L.R.B.), St George’s University Hospitals NHS Foundation Trust, London, United Kingdom.
4. Neurology Department (R.W., S.T., L.Z., A.C.P., A.H.H.), St George’s University Hospitals NHS Foundation Trust, London, United Kingdom.
5. Clinical Neurosciences, Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, United Kingdom (J.A.R.N., D.B.).