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Jiménez-Corona A, López-Ridaura R, Williams K, González-Villalpando ME, Simón J, González-Villalpando C.Jiménez-Corona A, et al.Salud Publica Mex. 2009 Jul-Aug;51(4):298-305. doi: 10.1590/s0036-36342009000400006.Salud Publica Mex. 2009.PMID: 19668924