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\bibitem{Halfen+Gremy2000} Halfen, S., \& Gremy, I. (2000). \textit{Toxicomanies et r{\'e}duction des risques en Ile-de-France}. Paris: Observatoire r{\'e}gional de sant{\'e} d{\textquoteright}Ile-de-France (ORS Ile-de-France).

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