1. Brain Tumor Research Center; Beijing Neurosurgical Institute; Capital Medical University and Department of Neurosurgery; Beijing Tiantan Hospital Affiliated to Capital Medical University; Beijing Laboratory of Biomedical Materials; Beijing 100050 P. R. China
2. Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology); Ministry of Education; Beijing Laboratory of Biomedical Materials; Beijing Advanced Innovation Center for Soft Matter Science and Engineering; Beijing University of Chemical Technology; Beijing 100029 P. R. China