1. From the Cardiology Unit of the Department of Medicine (I.G., A.J.M., H.K., S.M., M.W.B., I.C., W.Z.) and the Department of Biostatistics and Computational Biology (W.J.H.), University of Rochester Medical Center, Rochester, NY, the University of Buffalo, Buffalo, NY (J.G.) and Zakład Elektrokardiologii, Katedra Kardiologii i Kardiochirurgii, Uniwersytet Medyczny w Łodzi, Łodz, Poland (I.C.)