[1] Univ Paris 05, INSERM, UMR894, Dept Neurol,Hop St Anne, Paris, France
[2] Univ Coll London, Inst Neurol, Paris, France
[3] London Sch Hyg & Trop Med, Med Stat Unit, Dept Epidemiol & Populat Hlth, London WC1, England
[4] Univ Med Ctr Utrecht, Dept Neurol, Utrecht, Netherlands
[5] Univ Med Ctr Utrecht, Julius Ctr Hlth Sci & Patient Care, Utrecht, Netherlands
[6] Univ Hosp Henri Mondor, Dept Vasc Surg, Creteil, France
[7] Univ Basel Hosp, Dept Neurol, CH-4031 Basel, Switzerland
[8] Univ Basel Hosp, Stroke Unit, CH-4031 Basel, Switzerland
[9] Univ Paris 05, Hop Europeen Georges Pompidou, Clin Res Unit, Paris, France
[10] Med Univ Innsbruck, Dept Vasc Surg, A-6020 Innsbruck, Austria
[11] Univ Alabama Birmingham, Dept Biostat, Birmingham, AL 35294 USA
[12] Schleswig Holstein Univ Hosp, Dept Neuroradiol, Kiel, Germany
[13] Univ Med Ctr Utrecht, Dept Radiol, Utrecht, Netherlands
[14] Lenox Hill Hosp, Dept Intervent Cardiol, New York, NY 10021 USA
[15] Univ Heidelberg Hosp, Dept Neurol, Heidelberg, Germany
[16] Mayo Clin, Dept Neurol, Jacksonville, FL 32224 USA
[17] UCL, Inst Neurol, Dept Brain Repair & Rehabil, London, England