1. Department of Neurology; Xuanwu Hospital; Capital Medical University; Beijing China
2. Beijing Geriatric Hospital; Beijing China
3. China-America Institute of Neuroscience; Xuanwu Hospital; Capital Medical University; Beijing China
4. Center of Stroke; Beijing Institute for Brain Disorders; Beijing China
5. Department of Neurosurgery; Wayne State University School of Medicine; Detroit Michigan
6. Department of Neurosurgery; Xuanwu Hospital; Capital Medical University; Beijing China