1. Juvenile Diabetes Research Foundation Center for the Prevention of Type 1 Diabetes in Finland (M.K., T.K., S.K., A.K., S.S., R.V., T.S., J.I., O.S., M.K.), FI-33014 Tampere, Finland
2. Medical School, University of Tampere, and Department of Pediatrics, Tampere University Hospital (M.K., T.K., M.K.), FI-33014 Tampere, Finland
3. Department of Pediatrics, University of Oulu (S.K., R.V.), FI-90014 Oulu, Finland
4. Departments of Pediatrics (A.K., S.S., T.S., O.S.), FI-20520 Turku, Finland
5. Virology (J.I.), University of Turku, FI-20520 Turku, Finland
6. Hospital for Children and Adolescents, University of Helsinki (M.K.), FI-00029 Helsinki, Finland