1. Department of Medicine, Slagelse Hospital, Ingemannsvej 30, 4200 Slagelse, Denmark
2. Department of Cardiology, Aalborg University Hospital, Aalborg, Denmark
3. Unit of Clinical Biostatistics and Epidemiology, Aalborg University Hospital, Aalborg, Denmark
4. Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
5. AF Study Group, Aalborg University Hospital, Aalborg, Denmark
6. Department of Cardiology, North Zealand Hospital, Hillerød, Denmark
7. Department of Public Health, University of Copenhagen, Copenhagen, Denmark
8. Liverpool Centre for Cardiovascular Science, University of Liverpool and Liverpool Heart & Chest Hospital, Liverpool, UK