1. Immunogenetics Laboratory, University of Turku, Turku, Finland;
2. Hospital for Children and Adolescents, University of Helsinki and Helsinki University Central Hospital, Helsinki, Finland;
3. Department of Pediatrics, Tampere University Hospital, Tampere, Finland;
4. Department of Pediatrics, University of Oulu, Oulu, Finland;
5. Department of Pediatrics, University of Turku, Turku, Finland;
6. Department of Clinical Microbiology, University of Eastern Finland, Kuopio, Finland.