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  • Competing interests: DL is the editor of SafetyLit and NP is associate editor. The SafetyLit electronic mailing list and website contain no advertising. SafetyLit is a free service. SafetyLit is currently financed through contracts with several government agencies of the State of California, USA. Funding from the US Centers for Disease Control and Prevention and the Health Resources and Services Administration contributed to the development of the software that runs the SafetyLit website.

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