1. Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts.
2. Department of Pediatrics, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts.
3. The Department of Spine Surgery, the First Hospital of Jilin University, Changchun, China.
4. Cerebrovascular Research Center, Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China.