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\bibitem{Lurie_etal1993} Lurie, P., Reingold, A. L., Bowser, B., Chen, D., Foley, J., Guydish, J., et al. (1993). \textit{The public health impact of needle exchange programs in the United States and abroad : summary, conclusions and recommendations}. Berkeley; San Francisco: University of California, School of Public Health; University of California, Institute for Health Policy Studies.

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