1. From the Department of Cardiology (M.R.H., J.V., M.H., L.S., L.v.M., R.D., H.J.G.M.C., H.-P.B.-L.R., S.H.), Department of Clinical Genetics (I.K., J.V., A.v.d.W., E.V., M.W., H.G.B.), and Department of Cardiovascular Sciences (S.H.), Leuven University, Belgium; Belgium and Netherlands Heart Institute, Utrecht (S.H.); and Maastricht University Medical Centre, The Netherlands (S.H.).