1. Cardiovascular Research Center (J.E.H., R.M.), Massachusetts General Hospital, Boston.
2. Cardiology Division, Department of Medicine (J.E.H., L.W., C.S.B., T.C., A.S.E., K.M.H., P.P.P., R.M., M.N., G.D.L.), Massachusetts General Hospital, Boston.
3. Cedars-Sinai Medical Center, Los Angeles, CA (E.Z.K.).
4. Tufts University School of Medicine, Boston, MA (G.A.Z.).
5. Department of Pathology, Brigham and Women’s Hospital, Boston, MA (P.J.).