1. Faculty of Medicine and Dentistry, Blizard Institute, Queen Mary University of London, London E1 2AT, UK
2. First Department of Pediatrics, Aghia Sophia Children’s Hospital, National and Kapodistrian University of Athens, 11527 Athens, Greece
3. Emergency Department, Cambridge University Hospitals NHS Foundation Trust, Cambridge CB2 0QQ, UK
4. Department of Medicine, Cardiff University, Cardiff CF10 3AT, UK
5. Pediatric Emergency Department, Hospital Nacional de Niños, San José 0221, Costa Rica
6. Department of Emergency Medicine, Children’s Health Ireland at Crumlin, D12 N512 Dublin, Ireland