As concussions plague football, are there lessons from earlier concerns about boxing?

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More on the Story

N.F.L. Shifts on Concussions, and Game May Never Be the SameThe New York Times
Doctor: 'No question' that NFL great Ken Stabler had CTEESPN
Health Concerns Raised In 'Concussion' Not Limited To NFL AthletesForbes
What the NFL Can Learn from Boxing's DeclineThe Takeaway
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