1. CTE Center, Boston University School of Medicine, Boston, Massachusetts.
2. Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, Massachusetts.
3. Psychiatry Neuroimaging Laboratory, Harvard Medical School, Boston, Massachusetts.
4. Department of Child and Adolescent Psychiatry, Psychosomatic, and Psychotherapy, Ludwig-Maximilian-University, Munich, Germany.
5. Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
6. Alzheimer's Disease Center, Boston University School of Medicine, Boston, Massachusetts.
7. Interfaculty Initiative in Health Policy, Harvard University, Boston, Massachusetts.
8. Data Coordinating Center, Boston University School of Public Health, Boston, Massachusetts.
9. Department of Biostatistics, Boston University School of Public Health, Boston, Massachusetts.
10. Department of Environmental Health, Boston University School of Public Health, Boston, Massachusetts.
11. Center for Clinical Spectroscopy, Harvard Medical School, Boston, Massachusetts.
12. Department of Neurosurgery, Boston University School of Medicine, Boston, Massachusetts.
13. Sports Legacy Institute, Waltham, Massachusetts.
14. Department of Neurosurgery, Emerson Hospital, Concord, Massachusetts.
15. Department of Neurology, Boston University School of Medicine, Boston, Massachusetts.
16. VA Boston Healthcare System, Brockton Division, Brockton, Massachusetts.