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Niv N, Wong EC, Hser YI.Niv N, et al. Among authors: hser yi.J Subst Abuse Treat. 2007 Oct;33(3):313-9. doi: 10.1016/j.jsat.2006.12.012. Epub 2007 Mar 21.J Subst Abuse Treat. 2007.PMID: 17376635