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Thursday, May 23, 2013
11:46 pm, Wednesday, May 2, 2012 -- A concussion can occur when the head is either struck with an external force (e.g. a puck in ice hockey or a baseball) or from having a "whiplash" type collision (i.e. players running into each other at high speeds during a football game).
[...] additional symptoms such as nausea, vomiting,...
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