1. Department of Clinical Science University of Bergen Bergen Norway
2. Department of Pediatrics Haukeland University Hospital Bergen Norway
3. Environment and Health Department of Public Health and Primary Care KU Leuven–University of Leuven Leuven Belgium
4. The Hormone Laboratory Haukeland University Hospital Bergen Norway
5. Centre for Clinical Research Haukeland University Hospital Bergen Norway
6. Department of Global Public Health and Primary Care University of Bergen Bergen Norway
7. Department of Radiology Haukeland University Hospital Bergen Norway
8. Department of Clinical Medicine University of Bergen Bergen Norway
9. Department of Health Registries Norwegian Institute of Public Health Bergen Norway