[1] Fudan Univ, Huashan Hosp, Inst Neurol, Shanghai 200433, Peoples R China
[2] Capital Med Univ, Beijing Tiantan Hosp, Beijing, Peoples R China
[3] Beijing Union Med Coll Hosp, Dept Neurol, Beijing, Peoples R China
[4] Minist Publ Hlth, Beijing Hosp, Beijing, Peoples R China
[5] Kantonsspital Basel, Basel, Switzerland
[6] Bayer Healthcare China Co Ltd, Med & Sci Affairs Dept, Shanghai Branch, Shanghai, Peoples R China
[7] Bayer Schering Pharma AG, Bayer Healthcare, Global Clin Dev Clin Stat, Berlin, Germany
[8] Bayer Schering Pharma AG, Bayer Healthcare, Global Clin Dev Specialized Therapeut TA Neurol O, Berlin, Germany