1. From the Department of Surgery, Perelman School of Medicine at University of Pennsylvania, Philadelphia (P.P., E.B., J.B.G., E.K.L., R.C.G., J.H.G., J.E.B., G.F.); Centro Cardiologico Monzino IRCCS, Milan, Italy (P.P.); Columbia University–Valley Heart Center, Ridgewood, NJ (J.B.G.); and Department of Biomedical Engineering, University of Texas at Austin (M.S.S.).