1. Academic Department of Anaesthesia, Critical Care, Pain and Resuscitation, Heartlands Hospital, University Hospital Birmingham NHS Foundation Trust, Birmingham, UK
2. Warwick Medical School, University of Warwick, Coventry, UK
3. Intensive Care Unit, Royal Infirmary of Edinburgh, Edinburgh, UK
4. Division of Anaesthesia, Department of Medicine, University of Cambridge, Cambridge, UK
5. John V Farman Intensive Care Unit, Addenbrooke’s Hospital, Cambridge, UK