1. From the Department of Electrophysiology (C.P., C.E., S.R., K.B., P.S., T.G., S.K., U.W., A.B., D.H., N.D., M.E., A.A., G.H.), Heart Center, University of Leipzig, Leipzig, Germany; the Department of Cardiology (A.S.P., L.-H.B., W.H.), Charité, University Berlin Campus Virchow, Berlin, Germany; and the Coordination Center for Clinical Trials (M.M.), University of Leipzig, Leipzig, Germany.