1. Department of Cardiology in Norrköping, and Department of Health, Medicine and Caring Sciences, Linköping University , SE-581 83 Linköping , Sweden
2. Faculty of Health and Life Sciences, Linnaeus University , SE-351 95 Växjö , Sweden
3. Department of Cardiology in Linköping, and Department of Health, Medicine and Caring Sciences, Linköping University , SE-581 83 Linköping , Sweden