1. Paediatric Emergency Department Hospital Universitario Rio Hortega Valladolid Spain
2. Paediatric Emergency Department Biocruces Bizkaia Health Research Institute, Hospital Universitario Cruces, University of the Basque Country (UPV/EHU) Bilbao Spain
3. Paediatric Emergency Department Hospital Universitario Niño Jesús Madrid Spain
4. Subdirectorate of Innovation and Quality Hospital Universitario Cruces, University of the Basque Country (UPV/EHU) Bilbao Spain