1. Department of Immunology IIS‐Fundación Jiménez Díaz Madrid Spain
2. CIBER de Enfermedades Respiratorias (CIBERES) Madrid Spain
3. Pediatrics Department Severo Ochoa Hospital Leganés Spain
4. Translational Research Network in Pediatric Infectious Diseases (RITIP) Madrid Spain
5. Alfonso X El Sabio University Madrid Spain
6. Pediatric Infectious Diseases Department Hospital Universitario La Paz Madrid Spain
7. Fundación IdiPaz Madrid Spain
8. TEDDY Network (European Network of Excellence for Pediatric Clinical Research) Madrid Spain
9. Respiratory Virus and Influenza Unit National Microbiology Center (ISCIII) Madrid Spain
10. Epidemiology and Biostatistics Unit IIS‐Fundación Jiménez Díaz Madrid Spain