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\bibitem{Guggenbuehl+Uchtenhagen2000} Guggenb{\"u}hl, L., \& Uchtenhagen, A. (2000). Negotiation of qualitative requirements : overview on reported guidelines and criteria for professional quality in substance abuse treatment and care : quality criteria of the quality management system QuaTheDA (Switzerland). In \textit{Adequacy in drug abuse treatment and care in Europe (ADAT) : Part III: professionalism in treatment and care of drug addicts : country reports, guidelines, materials} (pp. 93--102;116). Zurich: Addiction Research Institute.

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