No abstract available
MeSH terms
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Accidents, Traffic / mortality*
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Accidents, Traffic / prevention & control
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Accidents, Traffic / statistics & numerical data
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Craniocerebral Trauma / epidemiology
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Craniocerebral Trauma / prevention & control*
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Government Regulation*
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Head Protective Devices*
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Humans
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Mandatory Programs / legislation & jurisprudence
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Motorcycles / legislation & jurisprudence*
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State Government*
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United States / epidemiology