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Understanding opioid reward.
Fields HL, Margolis EB. Fields HL, et al. Trends Neurosci. 2015 Apr;38(4):217-25. doi: 10.1016/j.tins.2015.01.002. Epub 2015 Jan 29. Trends Neurosci. 2015. PMID: 25637939 Free PMC article. Review.