[1] SUNY Buffalo, Jacobs Neurol Inst, Buffalo Neuroimaging Anal Ctr, Buffalo, NY 14260 USA
[2] Charles Univ Prague, Fac Med 1, Dept Neurol, Prague 2, Czech Republic
[3] Charles Univ Prague, Fac Med 1, Ctr Clin Neurosci, Prague 2, Czech Republic
[4] Gen Univ Hosp, Prague 2, Czech Republic
[5] Charles Univ Prague, Fac Med 1, Dept Radiol, Prague 2, Czech Republic
[6] Biogen Idec Inc, Weston, MA USA