1. From the Department of Medicine, University of Vermont College of Medicine, Burlington, VT (R.T.C., N.H., J.H.T.B., P.S.S.); School of Engineering, University of Vermont College of Engineering and Mathematical Sciences, Burlington, VT (R.T.C., B.B., J.H.T.B.); and Department of Biomedical Engineering, Boston University College of Engineering, Boston, MA (O.R.J.B.).