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\bibitem{Lenton_etal2000} Lenton, S., Kerry, K., Loxley, W., Tan-Quigley, A., \& Greig, R. (2000). Citizens who inject drugs : the {\textquotedblleft}Fitpack{\textquotedblright} study. \textit{International journal of drug policy}, \textit{11}(4), 285--297.

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