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Maciel AC, Guerra RO.Maciel AC, et al. Among authors: guerra ro.Rev Assoc Med Bras (1992). 2008 Jul-Aug;54(4):347-52. doi: 10.1590/s0104-42302008000400021.Rev Assoc Med Bras (1992). 2008.PMID: 18719794Free article.Portuguese.
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