1. From the Maryland Arrhythmia and Cardiology Imaging Group (MACIG) (T.K., M.A., M.S., R.H., R.A., B.F., O.M., S.S., S.S., A.S., V.S., S.S., W.C., V.D., T.D.), Division of Cardiology (T.K., M.A., R.H., R.A., B.F., O.M., S.S., S.S., A.S., V.S., S.S., T.D.), Department of Radiology (M.S., W.C., V.D.), University of Maryland, Baltimore; and Biosense Webster, Haifa, Israel (A.T.).