1. Division of Anaesthesia, University of Cambridge, Addenbrooke’s Hospital, Cambridge, England2Department of Critical Care Medicine, University Hospital of Birmingham National Health Service Trust, Queen Elizabeth Medical Centre, Birmingham, England
2. Division of Anaesthesia, University of Cambridge, Addenbrooke’s Hospital, Cambridge, England
3. Division of Anaesthesia, University of Cambridge, Addenbrooke’s Hospital, Cambridge, England3Department of Anesthesiology and Critical Care, University Hospital of Toulouse, Toulouse, France
4. Wolfson Brain Imaging Centre, Department of Clinical Neurosciences, University of Cambridge, Addenbrooke’s Hospital, Cambridge, England