[1] Cent South Univ, Xiangya Hosp, Dept Neurol, Changsha, Peoples R China
[2] Cent South Univ, Clin Res Ctr Cerebrovasc Dis Hunan Prov, Changsha, Peoples R China
[3] Cent South Univ, Xiangya Hosp, Natl Clin Res Ctr Geriatr Disorders, Changsha, Peoples R China
[4] Cent South Univ, Xiangya Hosp, Dept Neurol, 87, Xiangya Rd, Changsha 410008, Peoples R China