1. Department of Cardiology Oslo University Hospital Rikshospitalet Oslo Norway
2. Institute of Clinical Medicine, Faculty of Medicine University of Oslo Oslo Norway
3. KG Jebsen Center for Cardiac Research University of Oslo, Norway and Center for Heart Failure Research Oslo University Hospital Oslo Norway
4. Department of Cardiology Aarhus University Hospital Aarhus Denmark
5. Division of Image Processing Leiden University Medical Center Leiden The Netherlands