1. Division of Diagnostics and Specialist Medicine, Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden
2. Department of Cardiology, Linköping University, Linköping, Sweden
3. Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden
4. Department of Natural Sciences and Biomedicine, School of Health and Welfare, Jönköping University, Jönköping, Sweden
5. Department of Electrical Measurements, Lund University, Lund, Sweden