NFL confirms 29% drop in player concussions during 2018 regular season, NFL
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Concussions Dropped More Than 50 Percent for Players Who Wore Guardian Caps, NFL Says, News, Scores, Highlights, Stats, and Rumors
EXPLAINER: NFL using helmet caps for player safety, research
NFL: Concussions drop 50% with Guardian Caps : r/nfl
Concussions among players who wore Guardian Caps over summer dropped more than 50%, NFL says - ESPN
Concussions among players who wore Guardian Caps over summer dropped more than 50%, NFL says - ESPN
NFL report: concussions dropped 50 PERCENT when players wore new 'Guardian Caps' over the summer
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NFL says positions wearing Guardian Caps saw 52% decrease in concussions - NBC Sports
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