1. Department of Neurology, The Second Affiliated Hospital of Shandong First Medical University, Taian, Shandong 271016, P.R. China
2. Department of Neurosurgery, The Affiliated Taian City Central Hospital of Qingdao University, Taian, Shandong 271000, P.R. China
3. Department of Pathology, The Affiliated Taian City Central Hospital of Qingdao University, Taian, Shandong 271000, P.R. China