1. Department of Neurology; Beijing Tiantan Hospital; Capital Medical University; Beijing China
2. China National Clinical Research Center for Neurological Diseases; Beijing China
3. Center of Stroke; Beijing Institute for Brain Disorders; Beijing China
4. Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease; Beijing China
5. Neurology Department; St George's Hospital; London UK
6. Los Angeles Biomedical Research Institute at Harbor-UCLA; Los Angeles CA USA