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With Eye on Concussions, NFL Adopts New Rule on Helmet Hits
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Study: Many NFL players wore low-rated helmets – The Denver Post
Helmets and Mouthguards Don't Prevent Concussions
Helmets don't eliminate concussions. It's time for the NFL to ditch them, NFL
League of Denial: The NFL, Concussions and the Battle for Truth: 9780770437541: Fainaru-Wada, Mark, Fainaru, Steve: Books
Everything you need to know about the NFL's helmet guidelines and restrictions - Canal Street Chronicles
NFL hopes to reduce head injuries with helmet experiment
NFL hopes to reduce head injuries with helmet experiment
How New Helmet Technology Will Make the NFL and NHL Safer, News, Scores, Highlights, Stats, and Rumors