University of Copenhagen - The Heart Center, University of Copenhagen, Statens Serums Institut, University of Copenhagen - Herlev & Gentofte University Hospital, University of Copenhagen - Amager-Hvidovre Hospital, Aalborg University - Aalborg University Hospital & Clinical Institute, Aarhus University - Aarhus University Hospital, Odense University Hospital, Bispebjerg and Frederiksberg Hospitals, Aalborg University, Statens Serums Institut, Statens Serums Institut, Hospital of Southern Jutland, University of Copenhagen - Department of Cardiology, Odense University Hospital - Department of Cardiology, University of Copenhagen - Herlev & Gentofte University Hospital, Bispebjerg and Frederiksberg Hospitals, Aalborg University, Aarhus University - Department of Cardiology, University of Copenhagen - The Heart Center, University of Copenhagen - The Capital Regions Unit for Inherited Cardiac Diseases, University of Copenhagen - Department of Clinical Medicine and University of Copenhagen - The Heart Center