1. Department of Cardiology Oslo University Hospital, Rikshospitalet Oslo Norway
2. Transplant Institute Sahlgrenska University Hospital Gothenburg Sweden
3. The Clinic for Heart Failure and Valvular Disease Skåne University Hospital Lund Sweden
4. Lund University Lund Sweden
5. Department of Cardiology Rigshospitalet Copenhagen Denmark
6. Department of Cardiology Aarhus University Hospital Aarhus Denmark
7. Helsinki University Hospital Heart and Lung Center Helsinki Finland
8. University of Helsinki Helsinki Finland
9. KG Jebsen Center for Cardiac Research University of Oslo Norway and Center for Heart Failure Research Oslo University Hospital Norway