For safety's sake: A star player quits pro football
How the NFL's concussion-spotting system is working, and isn't
How football raises the risk for chronic traumatic encephalopathy
NFL Players Who Experienced Concussion Symptoms During Careers
The NFL and players union agreed to an updated concussion protocol
Only 23, another NFL player is retiring early because of
For some, NFL concussion settlement proposal is yet another injury
NFL Concussions: The 2012-13 Season In Review
Why Sports Concussions Are Worse For Women - Scientific American
Parents File Concussion Lawsuit Against FIFA, U.S. Soccer and AYSO
CTE in Seau, Other Former NFL Players: What Now for Football and
Tua Tagovailoa's head injury puts NFL concussion protocol under
Head Injuries & American Football - Ethics Unwrapped