1 Department of Anaesthesia and Intensive Care, Milton Keynes University Hospital NHS Trust, Milton Keynes, UK.
2 Departments of Anaesthesia and Intensive Care, Galliera Hospital, Genova, Italy.
3 Departments of Anaesthesiology and Surgical-Trauma Intensive Care, Hospital Clinic Universitari de Valencia, University of Valencia, Valencia, Spain.
4 Department of Neuro Critical Care, NCCU, Cambridge University Hospital NHS Foundation Trust, Cambridge, UK.