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Cheung A, Dewa C, Michalak EE, Browne G, Levitt A, Levitan RD, Enns MW, Morehouse RL, Lam RW.Cheung A, et al. Among authors: levitan rd.Depress Res Treat. 2012;2012:628434. doi: 10.1155/2012/628434. Epub 2012 Oct 18.Depress Res Treat. 2012.PMID: 23119154Free PMC article.