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Can That Mouth Guard Really Prevent A Concussion?

04:32
<p>NFL Commissioner Roger Goodell answers questions from the media after speaking about concussions Monday at the Congress of Neurological Surgeons in Washington, D.C. </p> (AP)

NFL Commissioner Roger Goodell answers questions from the media after speaking about concussions Monday at the Congress of Neurological Surgeons in Washington, D.C.

(AP)

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