1. From the Departments of Medicine (S.S., M.R.A., S.C., B.O.) and Biomedical Engineering (S.S., B.M., S.C., N.T.), Johns Hopkins University School of Medicine, Baltimore, MD; Division of Cardiovascular Disease, University of Alabama at Birmingham (L.Z.); and Institute of Biophysics, Medical University Graz, Graz, Austria (G.P.).