1. Department of Internal Medicine, Stavanger University Hospital, Stavanger, Norway
2. Institute of Medicine, University of Bergen, Bergen, Norway
3. Section of Clinical Biochemistry, Haukeland University Hospital, Bergen, Norway
4. Department of Cardiology, Haukeland University Hospital, Bergen, Norway
5. Department of Pathology, Stavanger University Hospital, Stavanger, Norway
6. Norwegian Institute of Public Health, Oslo, Norway
7. Department of Internal Medicine, Haukeland University Hospital, Bergen, Norway