1. Department of Radiology Xuanwu Hospital Beijing China
2. Department of Emergency Xuanwu Hospital Beijing China
3. Department of Neurology Xuanwu Hospital Beijing China
4. Department of Neurosurgery Xuanwu Hospital Beijing China
5. Biomedical Imaging Research Institute Cedars Sinai Medical Center Los Angeles California
6. Neurology Beth Israel Deaconess Medical Center Boston Massachusetts