1. Department of Neurosurgery, Tianjin Neurological Institute, Tianjin Medical University General Hospital, Tianjin, China.
2. Department of Neurosurgery, Shanxi Medical University First Hospital, Taiyuan, China.
3. Department of Immunology, Tianjin Medical University, Tianjin, China.
4. Puget Sound Blood Center, Seattle, Washington.
5. Division of Hematology, Department of Medicine, University of Washington, School of Medicine, Seattle, Washington.