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\bibitem{Coppola_etal1994} Coppola, R. C., Manconi, P. E., Piro, R., Di Martino, M. L., \& Masia, G. (1994). HCV, HIV, HBV and HDV infections in intravenous drug addicts. \textit{European Journal of Epidemiology}, \textit{10}, 279--283.

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