1. Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, 8200 Aarhus N, Denmark
2. Spange Statistics, Elleparken 10, 8520 Lisbjerg, Denmark
3. Department of Cardiology, Hobrovej 18-20, 9000 Aalborg University Hospital, Aalborg, Denmark
4. Department of Cardiology, Odense University Hospital, J. B. Winsløws Vej 4, 5000 Odense C, Denmark
5. Department of Cardiology, Copenhagen University Hospital Gentofte, Gentofte Hospitalsvej 1, 2900 Hellerup, Denmark
6. Department of Cardiology, Copenhagen University Hospital, Blegdamsvej 9, 2100 Copenhagen Ø, Denmark