1. Department of Social and Welfare Studies, Faculty of Health Sciences, Linköping University, Linköping, Sweden.
2. Department of Cardiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.
3. Department of Nursing, School of Health Sciences, Jönköping University, Jönköping, Sweden.
4. Department of Medical and Health Sciences, Division of Nursing, Faculty of Health Sciences and Department of Cardiology, Linköping University, Linköping, Sweden.