[1] Univ Dusseldorf, Dept Neurol, Dusseldorf, Germany
[2] Univ Dusseldorf, Ctr Neuropsychiat, Dusseldorf, Germany
[3] McGill Univ, Montreal Neurol Inst, Dept Neurol & Neurosurg, Montreal, PQ H3A 2B4, Canada
[4] Cleveland Clin, Mellen Ctr, Cleveland, OH 44106 USA
[5] Cleveland Clin, Dept Biomed Engn, Cleveland, OH 44106 USA
[6] Univ Cambridge, Addenbrookes Hosp, Cambridge CB2 2QQ, England
[7] Univ Texas Med Branch, Round Rock, TX USA
[8] Charles Univ Prague, Dept Neurol, Sch Med 1, Prague, Czech Republic
[9] Med Univ Lodz, Dept Neurol, Lodz, Poland
[10] Genzyme, Cambridge, MA USA
[11] Univ Cambridge, Dept Clin Neurosci, Cambridge, England