1. From the Departments of Cardiology (J.-P.C., Y.A., J.S., B.B., R.D., J.G., L.P., G.M.), Haematology (C.L., A.A.), and Biostatistics (M.L.T.), Pitié-Salpêtrière University Hospital, Paris, France; and Department of Cell & Developmental Biology (J.-P.C., J.W.W.), University of Pennsylvania School of Medicine, Philadelphia.