Institution: | 1. The Traumatic Brain Injury Centre, St Mary's Hospital, Imperial College, , London, W1 2NY;2. Centre for Altitude, Space, and Extreme Environment Medicine, University College London, , London;3. Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, , London;4. London's Air Ambulance, Queen Mary College, , London, E1 1BB;5. Caudwell Xtreme Everest Group, , London;6. Birmingham Medical Research Expeditionary Society, , Birmingham, United Kingdom;7. Lysholm Department of Neuroradiology, National Hospital for Neurology and Neurosurgery, , London;8. Health Services Research, City University London, , London;9. Medical School, University of Birmingham, , Birmingham;10. Department of Physiology, Development, and Neuroscience, University of Cambridge, , Cambridge;11. Department of Physiology, University of Oxford, , Oxford;12. Integrative Physiology and Critical Illness Group, Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, , Southampton;13. Anaesthesia and Critical care Research Unit, University Hospital Southampton NHS Foundation Trust |