1. Ningxia Key Laboratory of Cerebrocranial Disease, Ningxia Medical University, Yinchuan, Ningxia, China;
2. Department of Neurosurgery, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, China;
3. Department of Neurosurgery, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China