1. From the Department of Vascular Medicine (R.D., E.G., E.S.G.S., J.J.P.K.), Biomedical Engineering and Physics (E.V., J.A.D.), Clinical Epidemiology and Biostatistics (B.A.H.), and Department of Radiology (J.S.L., A.J.N.), Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.