1. Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway, the
2. Department of Virology, University of Tampere Medical School, Tampere, Finland;
3. Department of Microbiology, Center for Laboratory Medicine, Tampere University Hospital, Tampere, Finland;
4. Barbara Davis Center for Childhood Diabetes, University of Colorado School of Medicine, Aurora, Colorado;
5. Department of Epidemiology, University of Colorado School of Public Health, Aurora, Colorado;
6. Department of Human Genetics, Roche Molecular Systems, Alameda, California.