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\bibitem{EuropeanCentreforDiseasePreventionandControl+EuropeanMonitoringCentreforDrugsandDrugAddiction2011} European Centre for Disease Prevention and Control, \& European Monitoring Centre for Drugs and Drug Addiction. (2011). \textit{Prevention and control of infectious diseases among people who inject drugs}. Stockholm: European Centre for Disease Prevention and Control (ECDC).

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