1. From the Department of Biomedical Engineering, Washington University in St Louis, MO (V.F., C.M.A., G.K., W.J.H., A.V.G., I.R.E.); University of Connecticut Health Center, Farmington, CT (J.P.W., L.M.L.); and the Department of Surgery, Washington University School of Medicine, St Louis, MO (N.M.).