1. From the Ohio State University College of Medicine and Wexner Medical Center, The Frick Center for Heart Failure and Arrhythmia, The Dorothy M. Davis Heart and Lung Research Institute, Columbus (M.E.R., H.M., N.P.M., E.R.L., M.S., M.H., O.C., S.N.K., M.J.W., D.G., E.B., T.J.H., P.J.M.)
2. Department of Physiology and Cell Biology, Ohio State University, Columbus (M.E.R., H.M., N.P.M., E.R.L., M.S., M.H., O.C., S.N.K., M.J.W., P.J.M.)
3. Department of Biomedical Engineering, Ohio State University College of Engineering, Columbus (D.G., T.J.H.)
4. Department of Internal Medicine, Ohio State University College of Medicine, Columbus (E.B., T.J.H., P.J.M.)
5. Department of Molecular Physiology and Biophysics (K.M.A.), Baylor College of Medicine, Houston, TX.
6. Division of Cardiology, Department of Medicine (K.M.A.), Baylor College of Medicine, Houston, TX.
7. Division of Cardiology, Department of Pediatrics (K.M.A.), Baylor College of Medicine, Houston, TX.
8. Cardiovascular Research Institute, Baylor College of Medicine, Houston, TX (X.H.T.W.)