1. Center for Clinical Heart Research, Department of Cardiology, Oslo University Hospital Ullevål, P.O. Box 4950, Nydalen, N-0424 Oslo, Norway
2. Faculty of Medicine, University of Oslo, N-0370 Oslo, Norway
3. Norwegian Institute of Public Health, P.O. Box 222, Skøyen, N-0213 Oslo, Norway
4. Department of Research, Innlandet Hospital Trust, P.O. Box 104, N-2381 Brumunddal, Norway
5. Faculty of Health and Social Sciences, Inland Norway University of Applied Sciences, N-2624 Lillehammer, Norway
6. Department of Medical Sciences, Uppsala University, SE-751 85 Uppsala, Sweden
7. Division of Cardiovascular Medicine, Department of Medical and Health Sciences, Linköping University, SE-581 85 Linköping, Sweden