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Loyola Filho AI, Uchoa E, Guerra HL, Firmo JO, Lima-Costa MF.Loyola Filho AI, et al.Rev Saude Publica. 2002 Feb;36(1):55-62. doi: 10.1590/s0034-89102002000100009.Rev Saude Publica. 2002.PMID: 11887230Free article.Portuguese.