1. From the Institute of Cardiology (A.U., Z.S., D.D., K.Z.), Jagiellonian University School of Medicine, Cracow, Poland; John Paul II Hospital (J.Z., M.K.), Cracow, Poland; Swietokrzyskie Cardiology Centre (M.S., M.J.), Kielce, Poland; and Department of Hemodynamics (J.P., A.W.), Institute of Cardiology, Warsaw, Poland.