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\bibitem{Buster_etal2012} Buster, M., Giraudon, I., Matias, J., Vicente, J., \& Taylor, C. (2012). \textit{Mortality among drug users : guidelines for carrying out, analysing and reporting key figures 2011-2012}. Lisbon: European Monitoring Centre for Drugs and Drug Addiction, Prevalence, Consequences and Data Management Unit.

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