1 Department of Cardiology, Oslo University Hospital, Rikshospitalet, 0424 Oslo, Norway; Faculty of Medicine, University of Oslo, Oslo, Norway.
2 Centre for Biostatistics and Epidemiology, Oslo University Hospital, Rikshospitalet, 0424 Oslo, Norway; Centre for Clinical Heart Research, Oslo University Hospital, Rikshospitalet, 0424 Oslo, Norway.
3 Department of Cardiology, Oslo University Hospital, Rikshospitalet, 0424 Oslo, Norway.
4 Department of Cardiology, Oslo University Hospital, Rikshospitalet, 0424 Oslo, Norway; Faculty of Medicine, University of Oslo, Oslo, Norway. Electronic address: bbendz@ous-hf.no.