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Alcaro A, Panksepp J.Alcaro A, et al. Among authors: panksepp j.Neurosci Biobehav Rev. 2011 Oct;35(9):1805-20. doi: 10.1016/j.neubiorev.2011.03.002. Epub 2011 Mar 15.Neurosci Biobehav Rev. 2011.PMID: 21396397Review.