1. Department of Neurological Medicine, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China
2. Department of Outpatients, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China
3. Department of Geriatric Medicine, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China