1. From the Texas Cardiac Arrhythmia Institute at St David’s Medical Center (L.D.B., D.P., D.J.B., A.N.), Austin, Tex; the Department of Cardiology (L.D.B.), University of Foggia, Foggia, Italy; the Division of Cardiovascular Medicine (C.S.E.), Gill Heart Institute, University of Kentucky, Lexington, Ky; the Cleveland Clinic (D.O.M.), Cleveland, Ohio; the Sutter Pacific Heart Centers (R.H., S.H., S.B.), San Francisco, Calif; the Southlake Regional Health Center (Y.K.), New Market, Ontario, Canada; the...