[1] Univ Leuven, Dept Neurol, Leuven, Belgium
[2] Univ Munster, D-48149 Munster, Germany
[3] Lund Univ, Lund, Sweden
[4] Univ Barcelona, Dept Neurol, Barcelona, Spain
[5] Hosp Siegen, Seigen, Germany
[6] SYGNIS Biosci GmbH, Clin Res Dept, Heidelberg, Germany
[7] Univ Med Ctr Hamburg Eppendorf, Dept Neurol, Hamburg, Germany