1. Department of Cardiology Division of Medicine Akershus University Hospital Lørenskog Norway
2. Institute of Clinical Medicine, Faculty of Medicine University of Oslo Oslo Norway
3. Center for Clinical Heart Research Department of Cardiology Oslo University Hospital Ullevål Oslo Norway
4. Department of Cardiology Aalborg University Hospital and Aalborg University Aalborg Denmark
5. Department of Cardiology Stavanger University Hospital Stavanger Norway
6. Department of Clinical Science Faculty of Medicine University of Bergen Bergen Norway
7. Department of Medical Research Vestre Viken Hospital Trust, Bærum Hospital Gjettum Norway