[1] Capital Med Univ, China Natl Clin Res Ctr Neurol Dis Beijing, Neurol, Tiantan Hosp, Beijing, Peoples R China
[2] Beijing Tiantan Hosp, Dept Neurol, Beijing, Peoples R China
[3] Capital Med Univ, Beijing Tiantan Hosp, Dept Neurol, Beijing, Peoples R China