1. Department of Neurosurgery, University Hospital Southampton, Southampton, UK
2. Department of Neurosurgery, King’s College Hospital, London, UK
3. Department of Neurosurgery, Beaumont Hospital, Dublin, Ireland
4. Department of Neurosurgery, Leeds Teaching Hospitals, Leeds, UK
5. Department of Neurosurgery, University Hospitals Sussex, Brighton, UK
6. Department of Neurosurgery, Bristol Institute of Clinical Neuroscience, North Bristol NHS Trust, Bristol, UK
7. Department of Neurosurgery, University College London Hospitals, London, UK
8. Department of Neurosurgery, Cambridge University Hospitals, Cambridge, UK
9. Department of Neurosurgery, Barts Health NHS Trust, London, UK
10. Department of Neurosurgery, Barking, Havering and Redbridge University Hospitals, Romford, UK
11. Department of Neurosurgery, Manchester Centre for Clinical Neurosciences, Salford Royal Hospital, Manchester, UK
12. Department of Neurosurgery, Cardiff and Vale University Health Board, Cardiff, UK