Explaining concussionsDr. Sanjay Gupta explains the physiology of concussions and the long-term effects of suffering one.SI Staff|Share on FacebookShare on XAdd us on Dr. Sanjay Gupta explains the physiology of concussions and the long-term effects of suffering one.Published May 7, 2012 | Modified May 7, 2012SI STAFFShare on FacebookShare on XHome/NFL
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