1. Department of Clinical Biochemistry, AKH, Aarhus University Hospital, DK-8000 Aarhus C, Denmark
2. Department of Clinical Biochemistry, Randers Centralsygehus, DK-8700 Randers, Denmark
3. Department of Endocrinology and Metabolism, AAS, Aarhus University Hospital, DK-8000 Aarhus C, Denmark