1. Stroke Unit (G.J.H., K.L., J.P., M.T., C.J.M.K., P.D.), Departments of Haematology (J.W.E., R.B.), Pathology (F.v.B.), and Pharmacy (A.G.), Royal Perth Hospital, Perth, Australia;, School of Medicine & Pharmacology (G.J.H., J.W.E., F.v.B., R.B.), School of Population Health (S.H., M.L., K.J.), University of Western Australia;, Biostatistics Department (Q.Y.), Princess Margaret Hospital, Toronto, Canada;, Imperial College (K.J.), London, United Kingdom