1. From the Department of Radiology (S.D.R., J.J.M.W., T.A.M.K., H.J.L., A.d.R.), the Department of Cardiology (C.J.W.B., N.A.M., K.Z., M.J.S., J.J.B.), and the Division of Image Processing (R.J.v.d.G., J.H.C.R.), Leiden University Medical Center, Leiden, The Netherlands.