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\bibitem{Ghodse_etal1990} Ghodse, A. H., Jones, M. O., Gauntlett, A. N., Cremers, L., Schoemann, O., \& de Lammalle, J. P. (1990). \textit{The evaluation of methadone substitution therapy and its impact on HIV risk behaviours : protocol}. London; Brussels: St. George{\textquoteright}s Hospital Medical School; Projet Lama.

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