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Morales-Chávez M, Robles-García R, Jiménez-Pérez M, Morales-Romero J.Morales-Chávez M, et al.Salud Publica Mex. 2007 Jul-Aug;49(4):247-8. doi: 10.1590/s0036-36342007000400003.Salud Publica Mex. 2007.PMID: 17710272Spanish.No abstract available.