1. Lysholm Department of Neuroradiology; National Hospital for Neurology and Neurosurgery; London
2. Centre for Altitude, Space, and Extreme Environment Medicine; University College London; London
3. Health Services Research; City University London; London
4. Department of Neurosurgery; National Hospital for Neurology and Neurosurgery; London
5. The Traumatic Brain Injury Centre; St Mary's Hospital; Imperial College; London; W1 2NY
6. Department of Physiology, Development, and Neuroscience; University of Cambridge; Cambridge
7. Department of Physiology; University of Oxford; Oxford