Department of Clinical Cardiology, Odense University Hospital, J.B. Winsløws Vej 4, 5000 Odense C, Denmark; Department of Cardiology, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen Ø, Denmark; Department of Clinical Medicine, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen N, Denmark. Electronic address: jacob.moeller1@rsyd.dk.