Alzheimer's first blow. Head injuries raise risk.
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D000544:Alzheimer Disease / Q000453:epidemiology / Q000209:etiology*; D006259:Craniocerebral Trauma / Q000150:complications*; D006801:Humans; D008297:Male; D012307:Risk Factors; D014474:Unconsciousness; D014481:United States / Q000453:epidemiology