[1] Charite Univ Med Berlin, Max Delbruck Ctr Mol Med, Expt & Clin Res Ctr, Berlin, Germany
[2] Charite Univ Med Berlin, Dept Neurol, Berlin, Germany
[3] Charite Univ Med Berlin, Inst Biometry & Clin Epidemiol, Berlin, Germany
[4] Univ Calif San Francisco, Dept Neurol, San Francisco, CA 94143 USA
[5] Univ Basel Hosp, MS Ctr & Res, Ctr Clin Neuroimmunol & Neurosci, Neurol Clin & Policlin, Basel, Switzerland
[6] Univ Basel Hosp, Dept Clin Res, Clin Trial Unit, Basel, Switzerland
[7] Univ Calif Irvine, Dept Neurol, Irvine, CA 92717 USA