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\bibitem{BundesamtfuerGesundheit_etal2004} Bundesamt f{\"u}r Gesundheit, Office f{\'e}d{\'e}ral de la sant{\'e} publique, \& Swiss Federal Office of Public Health. (2004). \textit{Suchtforschung des BAG 1999-2001 : Band 2/3 : Pr{\"a}vention = Recherches de l{\textquoteright}OFSP en mati{\`e}re de d{\'e}pendances 1999-2001 : volume 2/3 : pr{\'e}vention}. Bern; Berne: Bundesamt f{\"u}r Gesundheit (BAG); Office f{\'e}d{\'e}ral de la sant{\'e} publique (OFSP); Swiss Federal Office of Public Health (SFOPH).

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