1. Department of General Paediatrics; Evelina Children's Hospital @St Thomas' Hospital; London; UK
2. Paediatric Infectious Disease and Tropical Diseases Unit; Paediatric Department; Carlos III Hospital; Madrid; Spain
3. Section of Paediatrics; Division of Infectious Diseases; Imperial College London; London; UK
4. Infectious Diseases Paediatric Unit; “Bambino Jesu” Hospital; Rome; Italy
5. HIV Department, ‘Dr. Victor Babes’ Hospital for Infectious and Tropical Diseases; Bucharest; Romania
6. Children's Infectious Diseases Department, Infectious Diseases Hospital; Medical University of Warsaw; Warsaw; Poland
7. Section of Infectious Diseases; Paediatric Department; Gregorio Marañon Hospital; Madrid; Spain
8. Department of Pediatric Hematology; Immunology and Infectious Diseases; Emma Children's Hospital/Academic Medical Center; Amsterdam; the Netherlands
9. Division of Clinical Sciences & Vaccine Institute; St George's; University of London; London; UK