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\bibitem{Costes_etal2009} Costes, J. - M., Vaissade, L., Colasante, E., Palle, C., Legleye, S., Janssen, E., et al. (2009). \textit{Pr{\'e}valence de l{\textquoteright}usage problematique de drogues en France : estimations 2006}. Saint-Denis-La Plaine: Observatoire fran{\c c}ais des drogues et des toxicomanies (OFDT).

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