1. Department of Intensive Care Medicine University Hospitals NHS Trust Plymouth UK
2. Department of Intensive Care Medicine North Bristol NHS Trust Bristol UK
3. Faculty of Medicine and Health Sciences University of Nottingham UK
4. Department of Radiology Nottingham University Hospital NHS Trust Nottingham UK
5. Department of Radiology North Bristol NHS Trust Bristol UK
6. Bristol Royal Hospital for Children and University Hospital Bristol and Weston NHS Foundation Trust Bristol UK
7. Department of Intensive Care Medicine and Anaesthesia East Lancashire Hospitals NHS Trust Lancashire UK
8. Royal College of Anaesthetists London UK
9. Department of Neuroradiology NHS Lothian Edinburgh UK
10. University of Edinburgh UK
11. South West Neurosurgery Centre University Hospitals NHS Trust Plymouth UK
12. Department of Neurosurgery University of Cambridge, Cambridge University Hospitals NHS Foundation Trust Cambridge UK
13. Department of Intensive Care Medicine Nottingham University Hospital NHS Trust Nottingham UK