1. From the Departments of Cardiology (M.M.L., T.G., K.N.) and Radiology (M.M.L., M.D., R.B., A.P., A.V., R.P.J.B., K.N.), Erasmus Medical Center, ‘s-Gravendijkwal 230, Room Ca-207a, Rotterdam 3015 CE, the Netherlands; Departments of Radiology (M. Kock, S.K.) and Cardiology (M. Kofflard), Albert Schweitzer Ziekenhuis, Dordrecht, the Netherlands; and Departments of Radiology (A.N., H.v.V.) and Cardiology (T.B.), Maasstad Ziekenhuis, Rotterdam, the Netherlands.