1. Department of Cardiology; Oslo University Hospital Ullevål; Norway
2. Center for Heart Failure Research; University of Oslo; Norway
3. Faculty of Medicine; University of Oslo; Norway
4. Section for Nuclear Medicine; Oslo University Hospital Ullevål; Norway
5. Biostatistic and Epidemiology Unit; Oslo University Hospital Ullevål; Norway
6. Center for Clinical Heart Research; Oslo University Hospital Ullevål; Norway