1. Consultant Anaesthetist Royal Victoria Infirmary Newcastle upon Tyne UK
2. The Medical School University of Newcastle Newcastle upon Tyne UK
3. Professor of Anaesthesia and Perioperative Medicine, Anaesthesia and Critical Care Research Group, Division of Clinical Neuroscience, Queens Medical Centre University of Nottingham Nottingham UK
4. Consultant and Honorary Professor in Intensive Care Royal Infirmary of Edinburgh, NHS Lothian Edinburgh UK