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California
Los Angeles
United States
Accidents, Traffic
Accidents, Occupational
Motorcycles
Head Protective Devices
Risk Factors
Incidence
Age Factors
Cohort Studies
Workplace
Odds Ratio
Wounds and Injuries
Brain Injuries
Occupational Diseases
Craniocerebral Trauma
Violence
Infants
Case Control Studies
Co-Publications
31
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5
4
3
2
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