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\bibitem{Sherval_etal2001} Sherval, J., Rostant, M., Dwyer, P., Riper, H., \& Korf, D. (2001). \textit{Guidelines for the evaluation of outreach work : a manual for outreach practitioners}  (European Monitoring Centre for Drugs and Drug Addiction, Ed.). Manuals, 2. Luxembourg: Office for Official Publications of the European Communities.

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