1. Innlandet Hospital Trust, Division Lillehammer, Department of Medicine, Lillehammer, Norway
2. Department of Cardiology, Oslo University Hospital, Rikshospitalet, and Faculty of Medicine, University of Oslo, Oslo, Norway
3. Sunnmøre Hospital Trust, Ålesund Hospital, Department of Medicine, Ålesund and Norwegian University of Science and Technology (NTNU), Trondheim, Norway
4. Asker and Bærum Hospital Health Authority, Department of Medicine, Asker, Norway
5. Oslo University Hospital Trust, Division Ullevål, Department of Cardiology, Oslo, Norway