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Nahas SC, Nahas CS, Silva Filho EV, Levi JE, Atui FC, Marques CF.Nahas SC, et al.Sao Paulo Med J. 2007 Sep 6;125(5):292-4. doi: 10.1590/s1516-31802007000500009.Sao Paulo Med J. 2007.PMID: 18094898Free PMC article.