Ex-NFL star Aaron Hernandez had 'most severe' brain disease - BBC News
Football 'literally killed' 24-year-old Zac Easter of Iowa. His family vows to make the sport safer.
Ninety-nine percent of ailing NFL player brains show hallmarks of neurodegenerative disease, autopsy study finds, Science
Guerrero finds path after brain injury - Grand Canyon University Athletics
Mouthguard technology detecting brain injuries to be adopted in rugby
USC not liable in former football player's death, jury finds in landmark case - CBS News
NFL Player Damar Hamlin Goes Into Cardiac Arrest
Evidence is growing that playing contact sports can lead to long-term brain injuries
Brain Injury in the NFL, Blogs
Exactly How Dangerous Is Football?
Opinion I'm the Wife of a Former N.F.L. Player. Football Destroyed His Mind. - The New York Times
Football 'literally killed' 24-year-old Zac Easter of Iowa. His family vows to make the sport safer.
Injuries make the NFL a brutal sport. But the violence is partly why fans love it
The link between head injuries and CTE in football, explained - Vox