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\bibitem{Harries-Hedder+Kerschl2001} Harries-Hedder, K., \& Kerschl, V. (2001). \textit{Quality development and quality assurance in outpatient rehabilitation of drugs addicts : quality indicators and norms for outpatient institutions of addiction help systems in Europe}. Li{\`e}ge: F{\'e}d{\'e}ration Europ{\'e}enne des Associations d Intervenants en Toxicomanie (ERIT).

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