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\bibitem{Mathers_etal2013} Mathers, B. M., Degenhardt, L., Bucello, C., Lemon, J., Wiessing, L., \& Hickman, M. (2013). Mortality among people who inject drugs : a systematic review and meta-analysis. \textit{Bulletin of the World Health Organization}, \textit{91}(2; 02/2013), 102--123.

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