1. From the Comprehensive Arrhythmia Research and Management Center, Division of Cardiovascular Medicine, School of Medicine, University of Utah Health, Salt Lake City (N.F.M.); Klinikum Coburg, Coburg (J.B.), Kardiologie an den Ev. Elisabeth-Kliniken (D.A.) and Biotronik (J.P.), Berlin, Klinik Rotes Kreuz, Frankfurt/Main (J.V.), Klinikum Links der Weser, Bremen (J.S.), Deutsches Herzzentrum München, Munich (H.S.), Institute of Medical Statistics and Computational Biology, Cologne (H.C.), and KMG Klinikum,...