1. Department of Pediatric Infectious Diseases, University Hospital La Fe, Valencia
2. Department of Pediatric Infectious Diseases, University Hospital La Paz, and La Paz Research Institute (IdiPAZ), Madrid
3. University Hospital Gregorio Marañón and Gregorio Marañón Research Institute (IiSGM), CoRISpe, Madrid
4. Pediatric Infectious Diseases and HIV Unit, University Hospital 12 de Octubre and Research Institute (I+12), Madrid
5. Pediatric Infectious Diseases Unit, Complejo Hospitalario Insular Materno Infantil Las Palmas, Las Palmas de Gran Canaria
6. Pediatric Infectious Diseases Unit, University Hospital Arnau de Vilanova, Lleida
7. Pediatric Infectious Diseases, Immunology and Rheumatology Unit, University Hospital Virgen del Rocío, and Instituto de Biomedicina de Sevilla (IBiS), Sevilla
8. Pediatric Infectious Diseases and Immunodeficiencies Unit, Hospital Universitari Vall d'Hebron, Barcelona
9. Pediatrics Department; University Hospital Niño Jesús, Madrid
10. Pediatrics Department, Complejo Asistencial Universitario de León, León
11. Pediatric Infectious Diseases Unit; Miguel Servet Pediatric Hospital, Zaragoza
12. Pediatric Infectious Diseases Unit, Hospital Germans Trias y Pujol, Universitat Autònoma de Barcelona, Badalona
13. Pediatrics Department, Hospital Clínico Lozano Blesa, Universidad Zaragoza, Zaragoza
14. Pediatrics Department, Clínico San Carlos University Hospital and Research Institute (IDISSC), Universidad Complutense de Madrid, Madrid
15. Department of Pediatric Infectious Diseases, Pediatrics Department, University Hospital Gregorio Marañón and Gregorio Marañón Research Institute (IiSGM), Universidad Complutense de Madrid, Madrid, Spain