1. Department of Cardiology, The Heart Centre, Rigshospitalet, Copenhagen, Denmark
2. Department of Cardiology, Gentofte Hospital, Gentofte, Denmark
3. Department of Cardiology, Skejby Hospital, Aarhus, Denmark
4. Department of Cardiology, Odense University Hospital, Odense, Denmark
5. Department of Cardiology, Aalborg Hospital South, Aalborg, Denmark