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Yang S, Salmeron BJ, Ross TJ, Xi ZX, Stein EA, Yang Y.Yang S, et al. Among authors: xi zx.Psychiatry Res. 2009 Dec 30;174(3):171-6. doi: 10.1016/j.pscychresns.2009.05.004. Epub 2009 Nov 10.Psychiatry Res. 2009.PMID: 19906515Free PMC article.