[1] Uniklin Koln, Dept Neurol, Cologne, Germany
[2] Hannover Med Sch, Dept Neurosurg, Hannover, Germany
[3] Charite, Dept Neurol, Berlin, Germany
[4] Univ Hosp Ctr Grenoble, Div Neurol, Grenoble, France
[5] Forschungszentrum Julich, Inst Neurosci & Med INM 3, Julich, Germany
[6] Univ Klinikum Wurzburg, Dept Neurol, Wurzburg, Germany
[7] Univ Marburg, Dept Neurol, Marburg, Germany