1. Department of Thrombosis and Hemostasis, Leiden University Medical Center, The Netherlands (N.v.R., W.M.L.).
2. Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, The Netherlands (N.v.R., W.M.L.).
3. Department of Clinical Epidemiology, Aarhus University Hospital, Denmark (N.v.R., U.H.-J., O.M.D., H.T.S.).
4. Department of Clinical Epidemiology, Leiden University Medical Center, The Netherlands (W.M.L., O.M.D., S.C.C.).