About the Authors
Department of Neurosurgery, Chinese People's Liberation Army(PLA) General Hospital, Beijng, People's Republic of China
The authors have declared that no competing interests exist.
Conceived and designed the experiments: YZH XLC BNX. Performed the experiments: YZH XLC. Analyzed the data: YZH XLC. Contributed reagents/materials/analysis tools: XLC BNX. Wrote the paper: YZH.