1. Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA.
2. Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, Massachusetts, USA.
3. Football Players Health Study at Harvard University, Harvard Medical School, Boston, Massachusetts, USA.
4. Athinoula A. Martinos Centre for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, Massachusetts, USA.
5. Vanderbilt Sports Concussion Center, Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
6. Division of Nuclear Medicine and Molecular Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA.
7. Channing Division of Network Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachsetts, USA.
8. Morehouse School of Medicine, Atlanta, Georgia, USA.
9. The Glenn Biggs Institute for Alzheimer's and Neurodegenerative Diseases, UTHSA, San Antonio, Texas, USA.
10. NHLBI's Framingham Heart Study, Framingham, Massachusetts, USA.
11. Department of Biostatistics and Neurology, Boston University School of Public Health, Boston, Massachusetts, USA.
12. Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Charlestown, Massachusetts 02129, USA.
13. Department of Physical Medicine and Rehabilitation, Harvard Medical School, Charlestown, Massachusetts, USA.
14. Department of Physical Medicine and Rehabilitation, Schoen Adams Research Institute at Spaulding Rehabilitation, Charlestown, Massachusetts, USA.
15. Sports Concussion Program, MassGeneral Hospital for Children, Boston, Massachusetts, USA.
16. Cardiovascular Performance Program, Massachusetts General Hospital, Boston, Massachusetts, USA.
17. Department of Cardiology, Lausanne University Hospital (CHUV) and Institute for Sport Science, University of Lausanne (ISSUL), Lausanne, Switzerland.