1. From the Department of Cardiology, Aalborg AF Study Group, Cardiovascular Research Centre, Aarhus University Hospital, Aalborg, Denmark (T.B.L., F.S., K.M.D., K.O., L.H.R.); Thrombosis Research Unit, Faculty of Medicine, Aalborg University, Aalborg, Denmark (T.B.L., G.Y.H.L., L.H.R.); University of Birmingham Centre for Cardiovascular Sciences, City Hospital, Birmingham, United Kingdom (G.Y.H.L.); and the School of Public Health, Aarhus University, Aarhus, Denmark (K.O.).