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AP Source: NFLPA fires consultant involved in Tagovailoa's
Without Updated Tools, NFL Is Still Finding Concussions Too Late
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The N.F.L. Issues New Guidelines on Concussions - The New York Times
N.F.L.'s Concussion Protocol Under Scrutiny After Tagovailoa
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NFL-NFLPA agree to a change in concussion protocols
NFL players union urges quick changes to concussion protocol