1. Emergency Department Hospital Infantil Universitario Niño Jesús Madrid Spain
2. Research Institute Hospital 12 de Octubre in Madrid (i+12) Foundation for Biomedical Research of the 12 de Octubre Hospital Madrid Spain
3. Department of Pediatrics Quiron Salud Madrid University Hospital Madrid Spain
4. Department of Pediatrics Hospital La Fe Valencia Spain
5. Paediatric Department Hospital Infanta Sofía Madrid Spain
6. Pediatric Infectious Diseases Unit, Department of Pediatrics, Hospital Universitario 12 de Octubre, Universidad Complutense Pediatric Research and Clinical Trials Unit (UPIC) Madrid Spain
7. Paediatric Department Hospital Infantil Universitario Niño Jesús Madrid Spain
8. Hospital Universitario Infanta Sofía Universidad Europea de Madrid Madrid Spain