1. Department of Neurosurgery, the First Affiliated Hospital of Anhui Medical University, Hefei 230032, P. R. China
2. School of Biomedical Engineering, Research and Engineering Center of Biomedical Materials, Anhui Medical University, Hefei 230032, P. R. China
3. Department of Radiotherapy, the First Affiliated Hospital of Anhui Medical University, Hefei 230032, P. R. China
4. The Center for Scientific Research of Anhui Medical University, Hefei 230032, P. R. China
5. Department of Neurosurgery, the Second Affiliated Hospital of Soochow University, Suzhou, 215004, P. R. China
6. School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, P. R. China