1. From the Institute for Stroke and Cerebrovascular Disease, The University of Texas Health Science Center at Houston, (S.I.S.)
2. Department of Neurology, Hôpital Sainte-Anne, University Paris Descartes, INSERM U1266, France (J.-C.B.)
3. Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA (M.F.).