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Carr KA, Daniel TO, Lin H, Epstein LH.Carr KA, et al. Among authors: epstein lh.Curr Drug Abuse Rev. 2011 Sep;4(3):190-6. doi: 10.2174/1874473711104030190.Curr Drug Abuse Rev. 2011.PMID: 21999693Free PMC article.Review.
Carr KA, Epstein LH.Carr KA, et al. Among authors: epstein lh.Learn Motiv. 2011 May 1;42(2):165-172. doi: 10.1016/j.lmot.2011.01.003.Learn Motiv. 2011.PMID: 21423567Free PMC article.