1. Department of Clinical Epidemiology, Aarhus University Hospital, 8200 Aarhus N, Olof Palmes Allé 43, Denmark
2. Department of The Danish Clinical Registers, Audit Unit West, Olof Palmes Allé 15, Aarhus N, Denmark
3. Diagnostic Centre, University Research Clinic for Innovative Patient Pathways, Silkeborg Region Hospital, Falkevej 1G, Silkeborg, Denmark
4. Danish Center for Clinical Health Services Research, Department of Clinical Medicine, Aalborg University and Aalborg University Hospital, Mølleparkvej 10, Aalborg, Denmark
5. Department of Cardiology, Odense University Hospital, Svendborg Hospital, Baagøes Allé 15, Svendborg, Denmark
6. Data & Documentation, DEFACTUM, Olof Palmes Allé 17, Aarhus N, Denmark
7. Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, Aarhus N, Denmark