Affiliation: | *Division of Paediatrics, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Linköping;†Immune Response Unit, Department of Vaccination and Immune Protection, National Institute for Health and Welfare, Helsinki;‡Hospital for Children and Adolescents, University of Helsinki, Helsinki;§Paediatric Clinic, Norrköping Hospital, Norrköping, Sweden |