1. Clinical Epidemiology Unit, Department of Medicine, Karolinska Institute, Stockholm, Sweden;
2. Department of Pediatrics, Kalmar County Hospital, Kalmar, Sweden;
3. Clinical Research Centre and
4. Division of Pediatrics and
5. Diabetes Research Centre, Linköping University, Linköping, Sweden
6. Department of Pediatrics, Örebro University Hospital, Örebro, Sweden; and