A traumatic brain injury (TBI) can occur from a sharp strain, or acceleration, to the human head. Based on the level of injury, TBIs are classified as mild, moderate, or severe, with the most common causes being motor vehicle crashes; violence related injuries; collisions in sports; and falls are the most common causes of TBIs for the general public. Many soldiers experience a TBI in combat zones when they are exposed to the shock waves from blasts, or to ballistic impacts.

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