1. Department of Cardiology, The Heart Centre, Copenhagen University Hospital , Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen , Denmark
2. Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte , Gentofte Hospitalsvej 1, 2900 Hellerup , Denmark
3. Department of Cardiology, Aarhus University Hospital , Palle Juul-Jensens Boulevard 99, 8200 Aarhus N , Denmark
4. Department fo Cardiology, Odense University Hospital , J B Winsløws Vej 4, 5000 Odense C , Denmark
5. Department of Cardiology, Aalborg University Hospital , Hobrovej 18-22, 9000 Aalborg , Denmark
6. Department of Clinical Medicine, Aalborg University Hospital , Hobrovej 18-22, 9000 Aalborg , Denmark
7. Department of Cardiology, Nordsjaellands Hospital , Dyrehavevej 29, 3400 Hillerød , Denmark
8. Department of Public Health, University of Copenhagen , Øster Farimagsgade 5, 1353 Copenhagen K , Denmark
9. Department of Forensic Medicine, Faculty of Medical Sciences, University of Copenhagen , Frederik V's Vej 11, 2100 Copenhagen Ø , Denmark