[1] China Natl Clin Res Ctr Neurol Dis, Beijing, Peoples R China
[2] Capital Med Univ, Beijing Tiantan Hosp, Dept Neurol, Beijing, Peoples R China
[3] Barrow Neurol Inst, Dept Neurol, Neurovasc Div, Phoenix, AZ 85013 USA
[4] Danube Univ Krems, Dept Clin Neurosci & Prevent Med, Krems, Austria
[5] Columbia Univ, Dept Neurol, Vagelos Coll Phys & Surg, New York, NY USA
[6] Columbia Univ, Dept Epidemiol, Mailman Sch Publ Hlth, New York, NY USA
[7] Univ Iowa, Dept Neurol, Roy J & Lucille Carver Coll Med, Iowa City, IA 52242 USA
[8] Univ Iowa, Roy J & Lucille Carver Coll Med, Dept Neurosurg, Iowa City, IA USA
[9] Univ Iowa, Coll Publ Hlth, Dept Epidemiol, Iowa City, IA USA