1. Department of Neurosurgery Tianjin Medical University General Hospital Tianjin China
2. Tianjin Neurological Institute Key Laboratory of Post‐Neuroinjury Neuro‐repair and Regeneration in Central Nervous System Tianjin Medical University General Hospital Ministry of Education Tianjin China
3. Department of Neurosurgery Tangdu Hospital Army Military University Xian China
4. Department of Neurosurgery Yangquan 1st People's Hospital Yangquan China
5. Division of Hematology Department of Medicine University of Washington School of Medicine Seattle Washington