To combat his several documented concussions while playing for the
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What Happens To A Football Player's Brain During A Concussion?
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Joshua Perry, Seahawks LB, retires at 24 after sixth concussion
FIFPRO renews call for temporary concussion substitution trials after BJSM's latest Consensus Statement on Concussion in Sport - FIFPRO World Players' Union
How many concussions is too many? Neurologists answer your questions. - The Washington Post
Football Player Had 'Worst' Brain Trauma Seen in Someone So Young, Doctor Says
An overview of concussion protocols across professional sports leagues - LawInSport
NFL Concussions: The 2013-14 Season In Review
What parents need to know about football, concussions and head injuries
Chronic traumatic encephalopathy - Wikipedia
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