1. Section of Anaesthetics, Pain Medicine and Intensive Care, Department of Surgery and Cancer, Imperial College, London, UK
2. Critical Care & Anaesthetics, Royal Marsden NHS Foundation Trust, London, UK
3. School of Medicine, Dentistry and Biomedical Sciences, Centre for Experimental Medicine, Institute for Health Sciences, Queen's University Belfast, Belfast, Northern Ireland
4. Regional Intensive Care Unit, Royal Victoria Hospital, Belfast, UK
5. Critical Care, Oxford University Hospitals NHS Foundation Trust, John Radcliffe Hospital, Oxford, UK
6. National Institute for Health Research, Evaluation, Trials and Studies Coordinating Centre (NETSCC), University of Southampton, Southampton, UK
7. Department of Surgery and Cancer, Imperial College London, London, UK
8. Intensive Care Medicine, Imperial College Healthcare NHS Trust, The Hammersmith Hospital, London, UK