1. From the Echocardiography Department (S.B.Z., S.H.L., W.A.Z.) and Department of Cardiovascular and Thoracic Surgery (G.M.L.), Houston Methodist DeBakey Heart and Vascular Center, TX; Department of Cardiology, Non Invasive Cardiology Unit, Affiliated with the Leviev Heart Center, Sheba Medical Center and Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel (S.B.Z.); and Department of Mathematics, University of Houston, TX (J.F., A.J., J.H., R.A.).