[1] Capital Med Univ, Xuanwu Hosp, Natl Clin Res Ctr Geriatr Dis, Beijing, Peoples R China
[2] Capital Med Univ, Xuanwu Hosp, Dept Neurobiol, Beijing, Peoples R China
[3] Capital Med Univ, Xuanwu Hosp, Neurol, Beijing, Peoples R China
[4] Capital Med Univ, Xuanwu Hosp, Geriatr, Beijing, Peoples R China
[5] Capital Med Univ, Xuanwu Hosp, Beijing Geriatr Healthcare Ctr, Beijing, Peoples R China
[6] Capital Med Univ, Xuanwu Hosp, Dept Evidence Based Med, Beijing, Peoples R China
[7] Beijing Inst Brain Disorders, Parkinson Dis Ctr, Beijing, Peoples R China
[8] Beijing Key Lab Parkinsons Dis, Beijing, Peoples R China