1. From the Department of Clinical Genetics (Z.A.B., M.A., I.v.L., M.M.A.M.M.), and Heart Failure Research Center (A.V.P., A.A.M.W.), Academic Medical Center, University of Amsterdam, The Netherlands; Departments of Cardiology (M.P.v.d.B., A.C.P.W.), Clinical Genetics (J.P.v.T.), and Pediatric Cardiology (M.T.E.B.-B.), University Medical Center, University of Groningen, The Netherlands, and Interuniversity Cardiology Institute of The Netherlands (M.P.v.d.B., A.A.M.W.).