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\bibitem{Steppan_etal2010} Steppan, M., Hildebrand, A., Lena, W., \& Pfeiffer-Gerschel, T. (2010). \textit{Jahresstatistik 2008 der professionellen Suchtkrankenhilfe in Deutschland = Annual statistical report for 2008 on treatment facilities for substance-use disorders in Germany}. M{\"u}nchen: Institut f{\"u}r Therapieforschung (IFT).

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