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\bibitem{Andre+Bleeker1993} Andr{\'e}, G., \& Bleeker, M. (1993). Question no 15-18 (Nettoyages des seringues/partage/lieu de procuration). In \textit{Approche de la pr{\'e}vention du SIDA en milieu nocturne} (pp. 90--91). Morges: Association du Relais.

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