1. Department of Clinical Biochemistry, Slagelse Hospital, Slagelse, Denmark;
2. Department of Laboratory Medicine, Nordland Hospital, Bodø, Norway;
3. Institute of Clinical Medicine, K.G. Jebsen TREC, UiT The Arctic University of Norway, Tromsø, Norway;
4. Department of Endocrinology, Stavanger University Hospital, Stavanger, Norway;
5. Department of Multidisciplinary Laboratory Medicine and Medical Biochemistry, Akershus University Hospital, Oslo, Norway;
6. Department of Clinical Biochemistry, University Hospital of Aarhus, Aarhus, Denmark;
7. Department of Clinical Biochemistry, Oslo University Hospital, Oslo, Norway;
8. Department of Clinical Biochemistry, Haukeland University Hospital, Bergen, Norway;
9. Department of Multidisiplinary Laboratory Medicin and Medical Biochemistry, Akershus University Hospital, Oslo, Norway;
10. Department of Clinical Biochemistry, Sykehuset Innlandet, Lillehammer, Norway;
11. Noklus, Haraldsplass Deaconess Hospital, Bergen, Norway;
12. Department of Clinical Biochemistry, Herning Hospital, Herning, Denmark;
13. Department of Clinical Biochemistry, Aalborg University Hospital, Aalborg, Denmark;
14. Department of Clinical Biochemistry, Randers Regional Hospital, Randers, Denmark;
15. Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway;
16. Department of Clinical Chemistry and Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden