[1] Dalian Med Univ, Qingdao Municipal Hosp, Dept Neurol, Qingdao, Peoples R China
[2] Qingdao Univ, Sch Med, Qingdao Municipal Hosp, Dept Neurol, Qingdao 266071, Peoples R China
[3] Univ Calif San Francisco, Dept Neurol, Memory & Aging Ctr, San Francisco, CA USA