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. Division of Hematology, Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA