1. Department of Neurology, Shengli Oilfield Central Hospital, Dongying, Shandong 257000, P.R. China
2. Department of International Special Needs Medicine, Shengli Oilfield Central Hospital, Dongying, Shandong 257000, P.R. China
3. Department of Neurology, Shengli Oilfield Central Hospital, Dongying, Shandong 257000, P.R. China