1. From the Helmsley Electrophysiology Center, Mount Sinai School of Medicine, New York, NY (S.R.D., A.d., V.Y.R.); Asklepios Klinik St. Georg, Hamburg, Germany (K.-H.K., A.M.); Homolka Hospital, Prague, Czech Republic (P.N.); Sentara Cardiovascular Research Institute, Norfolk, VA (I.W.); IKEM, Prague, Czech Republic (J.K.); University of Alabama at Birmingham, Birmingham, AL (H.T.M.); Cardioangiologisches Centrum Bethanien-CCB, Frankfurt, Germany (B.S.); University of California San Francisco School...