1. Ningxia Key Laboratory of Craniocerebral Disease, Incubation Base of National Key Laboratory, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R. China
2. Department of Diagnostic Pathology, School of Basic Medical Sciences, Weifang Medical University, Weifang, Shandong 261053, P.R. China
3. Department of Neurosurgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310006, P.R. China