1. Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital, Charlestown, Massachusetts
2. Program in Neuroscience, Harvard Medical School, Boston, Massachusetts
3. Vision Research Laboratories, New England Eye Center, Tufts University School of Medicine, Boston, Massachusetts
4. Brain Trauma Research Center, Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania
5. Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, U.S.A.