The Brain Injury Association of America (BIAA) defines a traumatic brain injury as "a blow or jolt to the head or a penetrating head injury that disrupts the function of the brain.  Not all blows or jolts to the head result in a TBI. The severity of such an injury may range from "mild" i.e., a brief change in mental status or consciousness to "server" i.e., an extended period of unconsciousness or amnesia after the injury.  A TBI can result in short or long-term problems with independent function."

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