1. Boston University Alzheimer's Disease Center, Boston University School of Medicine, Boston University, Boston, Massachusetts.
2. Center for the Study of Traumatic Encephalopathy, Boston University School of Medicine, Boston University, Boston, Massachusetts.
3. Department of Psychology, University of Colorado at Colorado Springs, Colorado Springs, Colorado.
4. Department of Biostatistics, Boston University School of Public Health, Boston University, Boston, Massachusetts.
5. Data Coordinating Center, Boston University School of Public Health, Boston University, Boston, Massachusetts.
6. Neurology Service, Veterans Affairs Boston Healthcare System, Jamaica Plain, Massachusetts.
7. Department of Neurology, Boston University School of Medicine, Boston, Massachusetts.
8. Department of Pathology, Boston University School of Medicine, Boston, Massachusetts.
9. Department of Neurosurgery, Emerson Hospital, Concord, Massachusetts.
10. Department of Neurosurgery, Boston University School of Medicine, Boston University, Boston, Massachusetts.