1. From the Department of Pediatrics, Hospital Universitario Fundación de Alcorcón, Alcorcón
2. PhD Program in Medicine, Universidad Complutense de Madrid
3. Pediatric Infectious Diseases Unit, Department of Pediatrics, Hospital General Universitario Gregorio Marañón, Instituto de Investigación Sanitaria Gregorio Marañón (IiSGM)
4. Centro de Investigación Biomedica en Red de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III, Madrid, Spain
5. Pediatric Infectious Diseases and Immunodeficiencies Unit, Hospital Universitari Vall d’Hebron
6. Pediatrics and Infectious Diseases Department, Hospital Clínico Universitario Virgen de la Arrixaca, Murcia, Spain
7. Department of Infectious Diseases and Tropical Pediatrics, Hospital Universitario La Paz and IdiPaz Foundation, Universidad Autónoma de Madrid, Red de Investigación Traslacional en Infectología Pediátrica (RITIP), Madrid, Spain
8. Department of Pediatrics, Hospital Universitario y Politécnico La Fe, Valencia, Spain
9. Department of Pediatrics, Complejo Hospitalario Regional de Málaga, Málaga, Spain
10. Pediatric Infectious Diseases Unit, Department of Pediatrics, Hospital Universitario 12 de Octubre, Madrid, Spain
11. Pediatric Infectious Diseases Unit, Department of Pediatrics, Hospital Universitari Son Espases, Palma de Mallorca, Spain
12. Department of Pediatrics, Hospital Universitario Niño Jesús, Madrid, Spain
13. Department of Pediatrics, Complejo Hospitalario Materno-Insular, Las Palmas de Gran Canaria, Spain
14. Department of Pediatrics, Hospital Universitario Marqués de Valdecilla, Santander, Spain
15. Department of Pediatrics, Hospital Universitario de Getafe, Getafe; and
16. Universidad Complutense de Madrid, Madrid, Spain.