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Echániz-Avilés G, Calderón-Jaimes E, Carnalla-Barajas N, Soto-Noguerón A, Cruz-Valdez A, Gatica-Marquina R.Echániz-Avilés G, et al.Salud Publica Mex. 1992 May-Jun;34(3):301-7.Salud Publica Mex. 1992.PMID: 1615348Spanish.
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Echániz-Avilés G, Tamayo-Legorreta E, Cruz-Valdez A, Rangel-Flores H, Hernández-Nevárez P, Gatica-Marquina R, Calderón-Jaimes E.Echániz-Avilés G, et al.Salud Publica Mex. 1993 Jan-Feb;35(1):20-6.Salud Publica Mex. 1993.PMID: 8385805Spanish.