1. Football Players' Health Study at Harvard University, Harvard Medical School, Boston, Massachusetts.
2. Neuroendocrine Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts.
3. Hinda and Arthur Marcus Institute for Aging Research and Center for Memory Health, Department of Neurology, Hebrew SeniorLife and Harvard Medical School, Boston, Massachusetts.
4. Guttmann Brain Health Institut, Institut Guttmann, Universitat Autònoma de Barcelona, Barcelona, Spain.
5. College of Pharmacy, Oregon State University/Oregon Health Science University, Portland, Oregon.
6. Cardiovascular Performance Program, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts.
7. Berenson-Allen Center for Noninvasive Brain Stimulation and Division for Cognitive Neurology, Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts.
8. Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, Massachusetts.
9. Department of Medicine, Dana-Farber Cancer Institute, Boston, Massachusetts.
10. Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts.
11. Department of Medicine, Cardiovascular Research Institute, Morehouse Medical School, Atlanta, Georgia.
12. Department of Physical Medicine and Rehabilitation, Brigham and Women's Hospital, Massachusetts General Hospital, Spaulding Rehabilitation Hospital, and Harvard Medical School, Boston, Massachusetts.
13. Department of Pediatrics and Orthopedics, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts.