1. Department of Clinical Physiology, Växjö Central Hospital, Växjö, Sweden;
2. Department of Research and Development, Region Kronoberg, Växjö, Sweden;
3. Department of Clinical Physiology, Division of Clinical Sciences, Lund University, Lund, Sweden;
4. Department of Medicine and Optometry, Linnaeus University, Växjö, Sweden;
5. Department of Cardiology, Section of Arrhytmias, Skåne University Hospital, Lund, Sweden