1. Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
2. State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
3. Department of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
4. Department of Orthopedic Surgery, 413 Hospital, Zhoushan, Zhejiang 316000, P.R. China
5. Department of Neurosurgery, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China