1. Infection and Immunity Group, Department of Biology, National University of Ireland, Maynooth, Ireland,
2. Department of Pediatrics, University Hospital, Linköping, Sweden,
3. Oxford Vaccine Group, Department of Paediatrics, John Radcliffe Hospital, Oxford, UK,
4. Department of Pediatrics, University of Umeå, Sweden,
5. Department of Pediatrics, County Hospital of Stavanger, Norway,
6. Public Health Laboratory Services, Colindale, London, UK,
7. Sachs’ Children’s Hospital, Stockholm, Sweden