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\bibitem{Michaud_etal2006} Michaud, P. - A., Berchtold, A., Jeannin, A., Chossis, I., \& Suris, J. - C. (2006). Secular trends in legal and illegal substance use among 16-20-year-old adolescents in Switzerland. \textit{Swiss Medical Weekly}, \textit{136}(19-20; 13.05.2006), 318--326.

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