1. Cerebral Haemodynamics in Ageing and Stroke Medicine (CHIASM) Research Group, Department of Cardiovascular Sciences, University of Leicester, Leicester LE2 7LX, UK
2. Department of Paediatrics, University Hospitals of Leicester NHS Trust, Leicester LE1 5WW, UK
3. Emergency Medicine Academic Group, Cardiovascular Sciences, University of Leicester, Leicester LE1 5WW, UK
4. Department of Health Sciences, Centre for Medicine, University of Leicester, Leicester LE1 7RH, UK
5. Paediatric Emergency Medicine Leicester Academic (PEMLA) Group, Leicester Royal Infirmary, Leicester LE1 5WW, UK