1. Academic Unit of Neurosurgery, Department of Clinical Neurosciences, University of Cambridge, Cambridge, United Kingdom.
2. Wolfson Brain Imaging Centre, Department of Clinical Neurosciences, University of Cambridge, Cambridge, United Kingdom.
3. School of Biological Sciences, University of Manchester, Manchester, United Kingdom.
4. School of Medicine, University of Manchester, Manchester, United Kingdom.
5. Division of Anaesthesia, Department of Medicine, University of Cambridge, Cambridge, United Kingdom.