1. Beijing Advanced Innovation Center for Soft Matter Science and Engineering; State Key Laboratory of Chemical Resource Engineering; Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology); Ministry of Education; Beijing Laboratory of Biomedical Materials; Beijing University of Chemical Technology; Beijing 100029 P.R. China
2. Brain Tumor Research Center; Beijing Neurosurgical Institute; Department of Neurosurgery; Beijing Tiantan Hospital Affiliated to Capital Medical University; Beijing 100050 China
3. California NanoSystems Institute; University of California Los Angeles; 570 Westwood Plaza Los Angeles CA 90095 USA