From the Department of Surgery (E.K.S., D.P.N., S.R.S., R.M.F., J.E.B., R.C.G., J.H.G., B.M.J.), Division of Cardiac Surgery (J.E.B., R.C.G., J.H.G.), and Division of Vascular Surgery and Endovascular Therapy (R.M.F., B.M.J.), University of Pennsylvania, Philadelphia, PA. (At 2013-09-10)