1. Department of Neurosurgery, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China
2. Department of Neurology, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China
3. Department of Neurosurgery, Brain Hospital of Liaocheng, Liaocheng, Shandong 252000, P.R. China