1. Center for Clinical Heart Research, Department of Cardiology, Oslo University Hospital Ullevaal, Oslo, Norway
2. Faculty of Medicine, University of Oslo, Oslo, Norway
3. Section of Cardiovascular and Renal research, Oslo University Hospital Ulleval, Oslo, Norway
4. Oslo Centre for Biostatistics and Epidemiology, Research Support Service, Oslo University Hospital, Oslo, Norway
5. Department of Cardiology, Section for Cardiology Intervention, Division of Cardiovascular and Pulmonary Diseases, Oslo University Hospital, Oslo, Norway
6. Department of Cardiology, Oslo University Hospital Ullevaal, Oslo, Norway