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Herrera-Huerta EV, García-Montalvo EA, Méndez-Bolaina E, López-López JG, Valenzuela OL.Herrera-Huerta EV, et al.Rev Peru Med Exp Salud Publica. 2012 Jul-Sep;29(3):345-9.Rev Peru Med Exp Salud Publica. 2012.PMID: 23085795Free article.Spanish.