1. From the Cerebrovascular Unit (P.T., L.D., F.P., N.N., J.H.), Hôpital Neurologique, Lyon, France; the Biostatistical Unit (P.A.), Hospices Civils de Lyon, France; and the Hemostasis Laboratory (M.H., P.F., M.D.), Hôpital Cardiologique, Lyon, France.