1. Department of Cardiology , Aarhus University Hospital , Aarhus , Denmark
2. Faculty of Health, Institute of Clinical Medicine , Aarhus University , Aarhus , Denmark
3. Department of Clinical Biochemistry , Aarhus University Hospital , Aarhus , Denmark
4. The Medical Research Laboratories , Department of Clinical Medicine , Faculty of Health Sciences , Aarhus University , Nørrebrogade 44, 8000 Aarhus C , Denmark