1. From the School of Medicine, Division of Cardiovascular Medicine (J.C.L., A.J., J.P.C., N.F.H.), Department of Pediatrics (T.C.D.), Department of Chemistry (G.H., S.D., J.T.R., A.L.A., H.D.), and Cardiovascular Institute (K.H.N., L.H., H.D., J.P.C., N.F.H.), Stanford University, CA; and Veteran Affairs Palo Alto Health Care System, Palo Alto, CA (K.H.N., L.H., N.F.H.).