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Concussion / Second-impact syndrome / Head injury / Knockout / Concussion grading systems / Health issues in American football / Neurotrauma / Medicine / Health
Date: 2010-09-22 17:14:03
Concussion
Second-impact syndrome
Head injury
Knockout
Concussion grading systems
Health issues in American football
Neurotrauma
Medicine
Health

A concussion is a brain injury

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