1. Department of Clinical Medicine University of Bergen Bergen Norway
2. Department of Public Health and Primary Care KU Leuven University of Leuven Leuven Belgium
3. Department of Clinical Science University of Bergen Bergen Norway
4. Department of Rheumatology Bergen Group of Epidemiology and Biomarkers in Rheumatic Disease Haukeland University Hospital Bergen Norway
5. Morbid Obesity Centre Vestfold Hospital Trust Oslo Norway
6. Department of Internal Medicine Haukeland University Hospital Bergen Norway
7. Department of Health Registries Norwegian Institute of Public Health Bergen Norway
8. Department of Paediatrics Haukeland University Hospital Bergen Norway