1. Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, P.R. China
2. Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, People's Republic of China
3. Key Laboratory of Post-trauma Neuro-repair and Regeneration in Central Nervous System, Ministry of Education, Tianjin, P.R. China
4. Tianjin Key Laboratory of Injuries, Variations and Regeneration of Nervous System, Tianjin, P.R. China