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Michigan repealed a 35-year mandatory helmet law on April 13, 2012. We examined the early clinical impacts at a level 1 trauma center in West Michigan.Retrospective cohort study comparing outcomes among motorcycle crash victims in a 7-month period before and after the helmet law repeal.One hundred ninety-two patients were included. After the repeal, nonhelmeted motorcyclists rose from 7% to 29% (P...
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