From the Division of Thoracic and Cardiovascular Surgery (W.F.J., M.S., N.H.P., A.M., M.L.S., G.A.), Division of Vascular and Endovascular Surgery (G.S., G.L., G.R.U.), Department of Molecular Physiology and Biological Physics, Robert M. Berne Cardiovascular Research Center (G.K.O., G.R.U.), and Department of Biomedical Engineering (G.A.), University of Virginia, Charlottesville, VA. (At 2014-09-09)