1. Department of Neurosurgery; Xinqiao Hospital; Third Military Medical University; Chongqing China
2. Department of Neurosurgery; The Second Hospital; Lanzhou University; Lanzhou China
3. Department of Neurosurgery; The First Hospital; Lanzhou University; Lanzhou China
4. Department of Anatomical and Cellular Pathology; The Chinese University of Hong Kong; Hong Kong
5. Institute of Pathology and Southwest Cancer Center; Southwest Hospital; Third Military Medical University; Chongqing China
6. Section of Molecular Pathology; International Agency for Research on Cancer; Lyon France