1. From the Translational Electrophysiology Unit, Department of Cardiology (M.J.H.v.C., A.Y., P.P.d.J., N.M.S.d.G.), and Department of Cardiothoracic Surgery (C.K.), Erasmus MC, Rotterdam, the Netherlands; Division of Cardiac Morphology, Royal Brompton Hospital and Imperial College London, United Kingdom (S.Y.H.); and Cardiovascular Research Institute Maastricht, University of Maastricht, the Netherlands (M.A.A.).