Article,

Helmets for Child Bicyclists

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JAMA: The Journal of the American Medical Association, 263 (14): 1914 (April 1990)
DOI: 10.1001/jama.1990.03440140034016

Abstract

Yet, despite an extensive bicycle helmet campaign in Seattle, Wash, the level of bicycle helmet use by children is only 15.7%. In the control city, Portland, Ore, it was 2.9%.

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