1. School of Health & Society, University of Salford, Salford, UK
2. Emergency Department, North Manchester General Hospital, The Pennine Acute Hospitals NHS Trust, Manchester, UK
3. Centre for Biostatistics, School of Health Sciences, University of Manchester, Manchester, UK
4. Northern Care Alliance NHS Group, Salford, UK
5. Children’s Emergency Department, Leicester Royal Infirmary, Leicester, UK
6. Paediatric Emergency Medicine, SAPPHIRE Group, University of Leicester, Leicester, UK