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\bibitem{Hungerbuehler_etal2011} Hungerbuehler, I., Buecheli, A., \& Schaub, M. (2011). \textit{Drug checking: a prevention measure for a heterogeneous group with high consumption frequency and polydrug use : evaluation of zurich{\textquoteright}s drug checking services} (Vol. 8). Zurich: Research Institute for Public Health and Addiction (RIPHA).

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