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\bibitem{Uchtenhagen_etal2000} Uchtenhagen, A., Gutzwiller, F., Dobler-Mikola, A., Steffen, T., \& Rihs-Middel, M. (2000). \textit{Cost-benefit analysis of heroin maintenance treatment}  (F. Gutzwiller, \& T. Steffen, Eds.). Basel: Karger.

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