1. Department of Neurosurgery, Tangshan Gongren Hospital, Tangshan, Hebei 063000, P.R. China
2. Department of Neurosurgery, Tangshan Gongren Hospital, Tangshan, Hebei 063000, P.R. China
3. School of Clinical Medicine, North China University of Science and Technology, Tangshan, Hebei 063000, P.R. China
4. Department of Neurology, Tangshan Gongren Hospital, Tangshan, Hebei 063000, P.R. China