1. Paediatric Hospital Medicine, Department of Paediatrics Hospital Universitari Vall d'Hebron Barcelona Spain
2. Department of Paediatrics, Obstetrics and Gynecology, Preventive Medicine and Public Health. Faculty of Medicine Universitat Autònoma de Barcelona Barcelona Spain
3. Infection in Immunocompromised Paediatric Patients Vall d'Hebron Research Institute Barcelona Spain
4. Paediatric Emergency Unit, Department of Paediatrics Hospital Universitari Vall d'Hebron Barcelona Spain
5. Respiratory Viruses Unit, Virology Section, Microbiology Department Hospital Universitari Vall d'Hebron Barcelona Spain
6. Paediatric Critical Care Unit, Department of Paediatrics Hospital Universitari Vall d'Hebron Barcelona Spain
7. Department of Information Systems and Decision Support Hospital Universitari Vall d'Hebron Barcelona Spain
8. Health Services Research Group Vall d'Hebron Research Institute Barcelona Spain
9. Department of Applied Statistics Universitat Autònoma de Barcelona Barcelona Spain
10. Department of Paediatrics Hospital Universitari Germans Trias i Pujol Barcelona Spain
11. Germans Trias i Pujol Research Institute Barcelona Spain
12. Paediatric Infectious Diseases and Immunodeficiencies Unit, Department of Paediatrics Hospital Universitari Vall d'Hebron Barcelona Spain