1. Harvard Interfaculty Initiative in Health Policy, Harvard University, Cambridge, Massachusetts.
2. Division of Sports Medicine, Boston Children's Hospital, Boston, Massachusetts.
3. Edmond J. Safra Center for Ethics, Harvard University, Cambridge, Massachusetts.
4. Boston University Chronic Traumatic Encephalopathy Center, Boston, Massachusetts.
5. Department of Social and Behavioral Sciences, Harvard School of Public Health, Boston, Massachusetts.
6. National Collegiate Athletic Association, Sport Science Institute, Indianapolis, Indiana.
7. Department of Behavioral Neuroscience, Boston University School of Medicine, Boston, Massachusetts.
8. Sports Legacy Institute, Boston, Massachusetts.
9. Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, Massachusetts.
10. VA Boston Healthcare System, Boston, Massachusetts.
11. Boston University Alzheimer's Disease Center, Boston, Massachusetts.
12. Department of Pathology, Boston University School of Medicine, Boston, Massachusetts.
13. Department of Neurology, Boston University School of Medicine, Boston, Massachusetts.
14. Department of Neurosurgery, Boston University School of Medicine, Boston, Massachusetts.