1. Department of Medicine, Drammen Hospital, Norway
2. Department of Behavioural Sciences in Medicine and Faculty of Medicine, University of Oslo, Norway
3. Department of Medicine, Vestfold Hospital, Norway
4. Department of Cardiology, Oslo University Hospital Rikshospitalet and Faculty of Medicine, University of Oslo, Norway
5. Department of Cardiology, Public Health Department, Linnaeus University, Kalmar, Sweden