1. Department of Vaccination and Immune Protection; National Institute for Health and Welfare; Helsinki Finland
2. Children's Hospital; University of Helsinki and Helsinki University Central Hospital; Helsinki Finland
3. Diabetes and Obesity Research Program; University of Helsinki; Helsinki Finland
4. Immunogenetics Laboratory; University of Turku; Turku Finland
5. Department of Clinical Microbiology; University of Eastern Finland; Kuopio Finland
6. Department of Pediatrics; University of Turku and Turku University Hospital; Turku Finland
7. Department of Pediatrics; University of Tartu and Children's Clinic of Tartu University Hospital; Tartu Estonia
8. Calcium Research Unit; University of Helsinki; Helsinki Finland
9. Department of Lifestyle and Participation; National Institute for Health and Welfare; Helsinki Finland
10. School of Health Sciences; University of Tampere; Tampere Finland
11. Science Centre; Pirkanmaa Hospital District; Tampere Finland
12. Folkhälsan Research Center; Helsinki Finland
13. Department of Pediatrics; Tampere University Hospital; Tampere Finland