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\bibitem{Buning1990} Buning, E. C. (1990). Review mechanisms for Aids related outreach activities : chapter selected from paper prepared by Amsterdam Municipal Health Service for WHO Regional Office for Europe. In \textit{Outreach work among drug users in the light of the AIDS epidemic} (pp. 24--32). Amsterdam: Gemeentelijke geneeskundige en gezondheidsdienst Amsterdam (GG\&GD).

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