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\bibitem{Gervasoni_etal1996} Gervasoni, J. - P., Dubois-Arber, F., Benninghoff, F., Spencer, B., Devos, T., \& Paccaud, F. (1996). \textit{Evaluation of the Federal measures to reduce the problem related to drug use : second synthesis report 1990-1996 : abridged version}. Lausanne: Institut universitaire de m{\'e}decine sociale et pr{\'e}ventive (IUMSP).

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