1. Department of Neurosurgery, the First Affiliated Hospital of Anhui Medical University, Hefei 230022, P. R. China
2. School of Biomedical Engineering, Research and Engineering Center of Biomedical Materials, Anhui Provincial Institute of Translational Medicine, Anhui Medical University, Hefei 230032, P. R. China
3. Department of Clinical Medicine, the First Clinical College of Anhui Medical University, Hefei 230032, P. R. China