1. School of Clinical Medicine, Tsinghua University, Beijing, China.
2. Department of Neurosurgery, Beijing Tsinghua Changgung Hospital, School of Clinical Medicine, Tsinghua University, Beijing, China.
3. Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.
4. Department of Neurosurgery, Beijing Neurosurgical Institute, Capital Medical University, Beijing, China.
5. Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.