1. Immunogenetics Laboratory; University of Turku; Turku Finland
2. Department of Pediatrics, Turku University Hospital; University of Turku; Turku Finland
3. Children' Hospital, Helsinki University Central Hospital; University of Helsinki; Helsinki Finland
4. Folkhälsan Research Center; Helsinki Finland
5. Department of Pediatrics; Tampere University Hospital; Tampere Finland
6. Department of Clinical Microbiology; University of Eastern Finland; Kuopio Finland