Report: 87 of 91 former NFL player brains have tested positive for CTE, NFL
CTE in the NFL: The tragedy of Fred McNeill
Concussion in sport crisis deepens as NFL star quits at 24 over fears of brain damage
Tennessee Titans News Links: I would sure take him. - Music City Miracles
NFL player's retirement at 24 prompts new debate about football concussions - The Washington Post
Former NFL Pro Bowl player fears he has CTE
Former NFL Pro Bowl player fears he has CTE
NFL concussion settlement leaves former players struggling for relief
Players With C.T.E. Doubled Risk With Every 5.3 Years in Football - The New York Times