1. Division of Neurosurgery, Department of Clinical Neurosciences, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK;
2. Department of Neurosurgery, Barts Health NHS Trust, London, UK;
3. Department of Clinical Neurosciences, NHS Lothian, Edinburgh, UK;
4. Department of Clinical Neuroscience, Western General Hospital, Edinburgh, UK;
5. Department of Neurosurgery, Nottingham University Hospitals Foundation Trust, Nottingham, UK;
6. Department of Neurosurgery, Queen's Hospital, Romford, UK;
7. Centre for Clinical Brain Sciences, University of Edinburgh, UK;
8. Division of Academic Neurosurgery, Manchester, UK;
9. Bristol Medical School, University of Bristol, Bristol, UK;
10. School of Medicine, University of Leeds, Leeds, UK;
11. Department of Neurosurgery, Leeds General Infirmary, Leeds, UK;
12. Keele Medical School, Keele University, Keele, UK;
13. Leicester Medical School, University of Leicester, Leicester, UK;
14. Brighton and Sussex Medical School, Brighton, UK;
15. Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, Oxford, UK;
16. Department of Neurosurgery, King's College Hospital NHS Foundation Trust, London, UK;
17. Department of Neurosurgery, Queen Elizabeth Hospital Birmingham, Birmingham, UK;
18. Department of Neurosurgery, Sheffield Teaching Hospitals, Sheffield, UK;
19. Department of Neurosurgery, Brighton and Sussex University Hospital, Brighton, UK