No abstract available
MeSH terms
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Adolescent
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Bicycling / injuries*
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Child
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Child, Preschool
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Craniocerebral Trauma / etiology
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Craniocerebral Trauma / prevention & control*
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Female
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Head Protective Devices / statistics & numerical data*
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Humans
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Male
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Multivariate Analysis
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Residence Characteristics
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Retrospective Studies
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United States