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\bibitem{Frisher_etal2012} Frisher, M., Baldacchino, A., Crome, I., \& Bloor, R. (2012). \textit{Preventing opioid overdoses in Europe : a critical assessment of known risk factors and preventative measures}. Lisbon: European Monitoring Centre for Drugs and Drug Addiction, Prevalence, Consequences and Data Management Unit.

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