1. Department of Internal Neurology, Binzhou Central Hospital, Binzhou, Shandong 251700, P.R. China
2. Department of Encephalopathy, Yangxin Hospital of Traditional Chinese Medicine, Binzhou, Shandong 251800, P.R. China
3. Department of Internal Neurology, People's Hospital of Rizhao, Rizhao, Shandong 276826, P.R. China