1. Department of Neurosurgery, Xinqiao Hospital, Third Military Medical University, Chongqing, P.R. China;
2. Department of Neurosurgery, Hainan General Hospital, Haikou, P.R. China;
3. Department of Radiology, Xinqiao Hospital, Third Military Medical University, Chongqing, P.R. China;
4. Department of Pathology, Xinqiao Hospital, Third Military Medical University, Chongqing, P.R. China