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Conde-González CJ, Lazcano-Ponce E, Hernández-Girón C, Juárez-Figueroa L, Smith JS, Hernández-Avila M.Conde-González CJ, et al.Salud Publica Mex. 2003;45 Supp 5:S608-16.Salud Publica Mex. 2003.PMID: 14974271Spanish.