1. Division of Nursing, Department of Social and Welfare Studies, Linköping University, Linköping, Sweden.
2. Department of Nursing, School of Health and Welfare, Jönköping University, Jönköping, Sweden.
3. Division of Nursing, Department of Medical and Health Sciences, Linköping University, Linköping, Sweden.
4. Department of Cardiology, Program in Nursing Science, University of California Irvine, Irvine, California.