1. Department of Neurosurgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, P.R. China.
2. Department of Neurosurgery, Second Affiliated Hospital of Kunming Medical College, Yuennan Province, P.R. China.
3. Department of Neurosurgery, Fuzhou General Military Hospital, Fujian Province, P.R. China.
4. Department of Neurosurgery, Changzhen Hospital, Second Military Medical University, Shanghai, P.R. China.
5. Department of Pathology, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, P.R. China.
6. Department of Neurosurgery, Changzhen Hospital, Second Military Medical University, Shanghai, P.R. China