1. Department of Neurology, The Fifth Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China
2. Department of Neurosurgery, The First Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China,
3. Center for Medical Experiments and Testing, Capital Medical University, Beijing 100069, P.R. China
4. Department of Neurosurgery, Peking Union Medical College Hospital, Beijing 100052, P.R. China