1. Department of Medicine, Drammen Hospital, Drammen, Norway
2. Department of Behavioral Sciences in Medicine and Faculty of Medicine, University of Oslo, Oslo, Norway
3. Department of Medicine, Vestfold Hospital, Tønsberg, Norway
4. Department of Cardiology, Public Health Department Linnaeus University, Kalmar, Sweden
5. Department of Cardiology, Oslo University Hospital Rikshospitalet and Faculty of Medicine, University of Oslo, Oslo, Norway
6. KG Jebsen Cardiac Research Center and Center for Heart Failure Research, Oslo University Hospital Ullevål, Oslo, Norway