1. Clinical medicine of Basic Medical College, HeBei Medical university, Shijiazhuang, Hebei, P. R. China
2. Department of Pathology, The Third Affiliated Hospital of Hebei Medical University, Shijiazhuang, Hebei, P. R. China
3. Department of Neurosurgery, The Second Hospital of Hebei Medical University, Hebei Medical University, Shijiazhuang, Hebei, China
4. Department of Radiology, The Third Hospital of Hebei Medical University, Shijiazhuang, China
5. Department of Orthopedic Oncology, Third Hospital of Hebei Medical University, Shijiazhuang, China.