How hard do you have to be hit to sustain a concussion? — Dr. Mark
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How hard do you have to be hit to sustain a concussion? This will come as a shock to no one: You must be hit very hard to sustain a concussion; not just any bump will do.
How hard do you have to be hit to sustain a concussion? — Dr. Mark Heisig
How hard do you have to be hit to sustain a concussion? — Dr. Mark Heisig
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