1. Department of Health Services Research and Policy, Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, UK
2. Academic Research Fellow, King’s College Hospital Emergency Department, London, UK
3. Department of Informatics, Faculty of Natural and Mathematical Sciences, King’s College London, London, UK
4. Florence Nightingale Faculty of Nursing and Midwifery and Palliative Care, Department of Adult Nursing, Kings’ College London and Royal College of Nursing, London, UK