1. Neuroprotection Research Laboratories, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts
2. Departments of Critical Care Medicine, Neurology and Neurosurgery, University of Pittsburgh, Pittsburgh, Pennsylvania
3. Department of Neurology, Cardio-Neurology Clinic, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
4. Cerebrovascular Research Center, XuanWu Hospital, Capital Medical University, Beijing, China