[url]http://sports.espn.go.com/nfl/news/story?id=2636795[/url]
[url]http://www.braininjuryresearchinstitute.org/wp-content/uploads/About-Brain-Injuries.pdf[/url]
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[url]http://stm.sciencemag.org/content/4/134/134ra60[/url]
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