[1] Johns Hopkins Univ, Dept Neurol, Baltimore, MD 21218 USA
[2] Univ Calif San Francisco, Dept Neurol, San Francisco, CA USA
[3] Univ Pavia, Dept Brain & Behav Sci, Pavia, Italy
[4] Charite Univ Med Berlin, Dept Neurol, Berlin, Germany
[5] Free Univ Berlin, Berlin, Germany
[6] Humboldt Univ, Berlin, Germany
[7] Berlin Inst Hlth, Berlin, Germany
[8] Mayo Clin, Dept Neurol Lab Med & Pathol, Coll Med, Rochester, MN USA
[9] Oklahoma Med Res Fdn, Arthrit & Clin Immunol Dept, 825 NE 13th St, Oklahoma City, OK 73104 USA