1. Cardiovascular Epidemiology Research Unit, Beth Israel Deaconess Medical Center, Boston, MA, USA
2. Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA
3. Department of Cardiology, Aalborg University Hospital, Denmark
4. Unit of Clinical Biostatistics, Aalborg University Hospital, Denmark
5. Aalborg Atrial Fibrillation Study Group, Department of Cardiology, Aalborg University Hospital, Denmark
6. Danish Cancer Society Research Center, Copenhagen, Denmark
7. Section for Epidemiology, Department of Public Health, Aarhus University, Denmark