1. From the Department of Cardiovascular Services, O’Connor Hospital and Heart & Rhythm Medical Group, San Jose, CA (M.S.); Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis (J.M.M.); Division of Cardiovascular Medicine, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia (D.J.C., F.E.M.); Unidad de Electrofisiología Cardiaca (Sala de Electrofisiología), Hospital Madrid Monteprincipe, Spain (J.M.A.); and Department of...