1. Department of Cardiology, Copenhagen University Hospital, Rigshospitalet , Inge Lehmanns Vej 7 2100 Copenhagen , Denmark
2. Department of Cardiology, Aarhus University Hospital , Aarhus , Denmark
3. Department of Clinical Medicine, Faculty of Health, Aarhus University , Aarhus , Denmark
4. Department of Cardiology, Nordsjællands Hospital , Hillerød , Denmark
5. Department of Cardiology, Odense University Hospital , Odense , Denmark
6. Department of Cardiology, Aalborg University Hospital , Aalborg , Denmark
7. Department of Cardiology, Herlev-Gentofte University Hospital , Hellerup , Denmark
8. Department of Cardiology, Zealand University Hospital , Roskilde , Denmark