1. Department of Neurosurgery, Hull University Teaching Hospitals, Hull, UK
2. Academic Neurosurgery Unit, Department of Clinical Neurosurgery, University of Cambridge, Cambridge, UK
3. Goffin Consultancy, Canterbury, UK
4. Department of Neurosurgery, University Hospitals Birmingham, Birmingham, UK
5. Department of Neurosurgery, National Hospital of Neurology and Neurosurgery, London, UK
6. Department of Neurosurgery, Royal Hallamshire Hospital, Sheffield, UK
7. Norwich Medical School, University of East Anglia, Norwich, UK
8. Royal Devon and Exeter NHS Foundation Trust, Exeter, UK
9. The Royal Orthopaedic Hospital NHS Foundation Trust, Birmingham, UK
10. Centre for Spinal Studies & Surgery, Queen’s Medical Centre, Nottingham, UK
11. Department of Neurosurgery, King’s College Hospital NHS Foundation Trust, London, UK
12. Institute of Psychiatry, Psychology & Neuroscience, King’s College London, London, UK
13. Edinburgh Spinal Surgery Outcome Studies Group, Department of Neurosurgery, Royal Infirmary of Edinburgh, Edinburgh, UK
14. Department of Spinal Surgery, East Suffolk and North Essex NHS Foundation Trust, Ipswich, UK
15. Department of Neurosurgery, St George’s University Hospitals NHS Foundation Trust, London, UK
16. WT MRC Cambridge Stem Cell Institute, Anne McLaren Laboratory, University of Cambridge, Cambridge, UK