1 Department of Paediatric Emergency Medicine, Barking Havering and Redbridge University Hospitals NHS Trust, Romford, UK.
2 Emergency Department, Bristol Royal Hospital for Children, Bristol, UK.
3 Research in Emergency Care Avon Collaborative Hub (REACH), University of the West of England, Bristol, UK.
4 Department of Paediatric Emergency Medicine, Children's Health Ireland, Dublin, Ireland.
5 Women's and Children's Health, School of Medicine, University College Dublin, Dublin, Ireland.
6 Department of Paediatric Endocrinology, Evelina London Children's Hospital, Guys and St.Thomas' NHS Foundation Trust, London, UK.
7 Division of Medicine, Department of Pediatric Emergency Medicine, St. Mary's Hospital-Imperial College NHS Healthcare Trust, London, UK.
8 Section of Pediatric Infectious Diseases, Department of Infectious Diseases, Faculty of Medicine, Imperial College London, UK Centre for Pediatrics and Child Health, London, UK.
9 SAPPHIRE Group, Health Sciences, Leicester University, Leicester, UK.
10 Paediatric Emergency Medicine Leicester Academic (PEMLA) Group, Children's Emergency Medicine, Leicester Royal Infirmary, Leicester, UK.