1. From the Department of Cardiology, Thoraxcenter (H.G.v.V., A.F.L.S., M.M.), Department of Clinical Genetics (R.A.O., M.A.v.S.), and Department of Pediatrics (I.M.E.F.-M.), Erasmus Medical Center, Rotterdam, The Netherlands; Department of Physiology, Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, The Netherlands (J.v.d.V.); and Netherlands Heart Institute, Utrecht (J.v.d.V.).