1. From the Division of Clinical Electrophysiology (J.B., S.S., T.K., P.K.) and Department of Cardiology (J.B., S.S., E.P.-P., B.Z., M.S.-F., T.K., P.K.), Grochowski Hospital, Postgraduate Medical School, Warsaw, Poland; Department of Radiology, Institute of Cardiology, Warsaw, Poland (I.M.); Institute of Control & Industrial Electronics, Warsaw University of Technology, Warsaw, Poland (R.L.).