1. Department of Paediatric and Adolescent Medicine Telemark Hospital Skien Norway
2. The Norwegian Childhood Diabetes Registry Oslo University Hospital Oslo Norway
3. Division of Health Services, Department for Research and Analysis of Health Services Norwegian Institute of Public Health Oslo Norway
4. Oslo Centre for Biostatistics and Epidemiology, Research Support Services Oslo University Hospital Oslo Norway
5. Division of Paediatric and Adolescent Medicine Oslo University Hospital Oslo Norway
6. Faculty of Medicine Institute of Clinical Medicine, University of Oslo Oslo Norway
7. Oslo Diabetes Research Centre Oslo University Hospital Oslo Norway