http://www.youtube.com/watch?v=eUitt_XQ2pQ&feature=related
159 concussions reported in the NFL in 2010. This article is about the effects concussions have on the body and symptoms of concussions. If not healed completely it is much easier to get another concussion or cause death.
I think this is a semi credible source. It relates well to my topic because it talks about how often concussions happen. But the author doesn't mention many sources. It is a fairly new article from last spring.
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