1. Cardiovascular Research Center, Division of Cardiology, Rhode Island Hospital, Warren Alpert Medical School of Brown University, Providence (B.-R.C., W.L., D.T., A.Y.K., R.T., T.Y.K., G.K.).
2. Department of Physics, Northeastern University, Boston MA (M.Z., C.M.R., A.K.).
3. Department of Medicine (Cardiology), University of California, Los Angeles (Z.Q.).
4. Department of Comparative Medicine, Pennsylvania State University College of Medicine, Hershey (X.P.).