1. Department of Cardiology; Linköping University Hospital; SE-58185, Linköping Sweden
2. Department of Medicine and Health Sciences, Division of Cardiovascular Medicine; Faculty of Health Sciences Linköping University; Linköping Sweden
3. Department of Cardiology; University Medical Centre Groningen, University of Groningen; Groningen The Netherlands
4. Department of Social and Welfare Studies; Faculty of Health Sciences Linköping University; Norrköping Sweden