1. Department of General Practice Institute of Health and Society University of Oslo Oslo Norway
2. Institute of Clinical Medicine Faculty of Medicine University of Oslo Oslo Norway
3. Department of Endocrinology, Morbid Obesity and Preventive Medicine Oslo University Hospital Oslo Norway
4. Norwegian Quality Improvement of Laboratory Examinations Haraldsplass Deaconess Hospital Bergen Norway
5. Department of Medicine Stavanger University Hospital Stavanger Norway
6. Department of Global Public Health and Primary Care University of Bergen Bergen Norway
7. Department of Clinical Biochemistry and Pharmacology Haukeland University Hospital Bergen Norway
8. Department of Medicine Nordland Hospital Bodø Norway
9. General Practice Research Unit (AFE) Department of General Practice Institute of Health and Society, University of Oslo Oslo Norway