1. School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
2. Research Center of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
3. Department of Neurosurgery, General Hospital of Tianjin Medical University, Tianjin, China
4. Department of Surgery, Tianjin Children's Hospital, Tianjin, China
5. School of Public Health, Tianjin Medical University, Tianjin, China