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Nasir A, Todd CS, Stanekzai MR, Bautista CT, Botros BA, Scott PT, Strathdee SA, Tjaden J.Nasir A, et al. Among authors: todd cs.Int J Drug Policy. 2011 Mar;22(2):145-52. doi: 10.1016/j.drugpo.2010.10.006. Epub 2010 Dec 10.Int J Drug Policy. 2011.PMID: 21146392Free PMC article.