1. From the Cardiovascular Research Center (F.P., D.G., C.S., P.T.E., F.d.M.) and Cardiac Arrhythmia Service (S.B.D., P.T.E.), Massachusetts General Hospital, Boston; Department of Gene and Cell Medicine, Mount Sinai Medical Center, New York, NY (Y.K., R.J.H.); and Dipartimento di Scienze Biomediche Sperimentali, University of Padova, Padova, Italy (C.S.). Dr Prunier is currently at the Centre Hospitalier Universitaire, Service de Cardiologie et UPRES 3860, Angers, France. Dr del Monte is currently at...