1. Department of Paediatric Infectious Diseases and Immunology; Great Ormond Street Hospital NHS Trust; London UK
2. Medical Research Council Clinical Trials Unit; London UK
3. Department of Paediatric Infectious Diseases; Imperial College Healthcare NHS Trust; London UK
4. Institute of Child Health; University College London; London UK
5. Radboud University Medical Center; Nijmegan The Netherlands
6. University Department of Immunology and Infectious Disease; Bambino Gesù Children's Hospital; Rome Italy
7. Our Lady's Children's Hospital Crumlin & University College Dublin; Dublin Ireland
8. Meyer University Hospital; Florence University; Florence Italy
9. HIV i-Base; London UK
10. Emilio Ribas Institute of Infectious Diseases; Sao Paulo Brazil
11. Paediatric Infectious Disease Unit; Luigi Sacco Hospital; University of Milan; Milan Italy
12. Department of Paediatrics; University of Padua; Padua Italy
13. Department of Health Sciences, Pediatric Unit; University of Florence; Florence Italy
14. Department of Pediatrics; CHU Saint-Pierre; Free University of Brussels; Brussels Belgium
15. Portsmouth Hospitals NHS Trust; Portsmouth UK
16. Paediatric Infectious Diseases and Immunodeficiencies Unit, Pediatric Department; Porto Central Hospital; Porto Portugal
17. Department of Clinical Microbiology and Virology; University College London Hospitals; London UK
18. Centre for Pediatric and Adolescent Medicine; HELIOS Hospital Krefeld; Krefeld Germany
19. Infectious Diseases Unit; Pediatrics Department; Sant Joan de Déu Hospital; University of Barcelona; Barcelona Spain
20. 12th of October Hospital; Madrid Spain
21. University Children's Hospital; Basel Switzerland
22. Department of Paediatric Immunology and Infectious Diseases; Emma Children's Hospital Academic Medical Centre; Amsterdam The Netherlands
23. Imperial College; London UK
24. Heartlands Hospital; Birmingham UK