1. Department of Cardiology, Center for Clinical Heart Research, Oslo University Hospital Ullevål, Oslo, Norway
2. Faculty of Medicine, Institute of Clinical Medicine, University of Oslo, Oslo, Norway
3. Division of Medicine, Department of Cardiology, Akershus University Hospital, Lørenskog, Norway
4. Department of Medical Research, Vestre Viken Hospital Trust, Baerum Hospital, Gjettum, Norway