Differences in outcomes of mandatory motorcycle helmet legislation by country income level: A systematic review and meta-analysis. by Jacob R Lepard, Riccardo Spagiari, Jacquelyn Corley, Ernest J Barthélemy, Eliana Kim, Rolvix Patterson, Sara Venturini, Megan E H Still, Yu Tung Lo, Gail Rosseau, Rania A Mekary, Kee B Park

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