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