1. Pediatric Hospital Medicine, Department of Pediatrics, Hospital Infantil Vall d’Hebron, Vall d’Hebron Barcelona Hospital Campus , Barcelona , Spain
2. Department of Pediatrics, Obstetrics and Gynecology, Preventive Medicine and Public Health, Faculty of Medicine, Universitat Autònoma de Barcelona , Barcelona , Spain
3. Infection in Immunocompromised Pediatric Patients, Vall d’Hebron Research Institute, Vall d’Hebron Barcelona Hospital Campus , Barcelona , Spain
4. Pediatric Emergency Unit, Department of Pediatrics, Hospital Infantil Vall d’Hebron, Vall d’Hebron Barcelona Hospital Campus , Barcelona , Spain
5. Preventive Medicine and Epidemiology Department, Hospital Universitari Vall d’Hebron, Vall d’Hebron Barcelona Hospital Campus , Barcelona , Spain
6. Research Unit Infections and Cancer, Institut Català d’Oncologia, Avinguda de la Gran Via de l’Hospitalet , Barcelona , Spain
7. Respiratory Viruses Unit, Virology Section, Microbiology Department, Hospital Universitari Vall d’Hebron, Vall d’Hebron Research Institute, Vall d’Hebron Barcelona Hospital Campus , Barcelona , Spain
8. Department of Pediatrics, Hospital Infantil Vall d’Hebron, Vall d’Hebron Barcelona Hospital Campus , Barcelona , Spain
9. Pediatric Critical Care Unit, Department of Pediatrics, Hospital Infantil Vall d’Hebron, Vall d’Hebron Barcelona Hospital Campus , Barcelona , Spain
10. Pediatric Infectious Diseases and Immunodeficiencies Unit, Department of Pediatrics, Hospital Infantil Vall d’Hebron, Vall d’Hebron Barcelona Hospital Campus , Barcelona , Spain
11. Department of Pediatrics, Hospital Universitari Germans Trias i Pujol , Barcelona , Spain
12. Germans Trias i Pujol Research Institute, Carretera de Can Ruti, Camí de les Escoles , Barcelona , Spain