1. From the Vascular Biology Section, Boston University School of Medicine, Boston, MA (R.M.W., T.S., L.A.S., J.L.F., R.A.C., F.S.); Biomedical Engineering (S.B., C.A.R.-K.) and Department of Biomedical Sciences, College of Veterinary Medicine (H.E.L.), Cornell University, Ithaca, NY; Department of Anesthesiology and Critical Care Medicine, John Hopkins University, Baltimore, MD (L.S.); and Cardiovascular Engineering, Inc, Norwood, MA (G.M.).