1. From the Department for Thrombosis Research (M.P.M.dM., E.M.B., J.J.), University of Southern Denmark, and the Department of Clinical Biochemistry (M.P.M.d.M., E.M.B., J.J., Ribe County Hospital, Esbjerg, Denmark; the Department of Hematology (M.P.M.dM.), Erasmus Medical Center, Rotterdam, the Netherlands; and Institute of Public Health (J.v.B.H., K.C.), Research Unit of Epidemiology, University of Southern Denmark.