1. Department of Clinical Biochemistry, Aarhus University Hospital , 8200 Aarhus , Denmark
2. Department of Endocrinology and Internal Medicine, Aarhus University Hospital , 8200 Aarhus , Denmark
3. Department of Internal Medicine, Horsens Regional Hospital , 8700 Horsens , Denmark
4. Department of Clinical Medicine, Aarhus University , 8200 Aarhus , Denmark