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Andrade V, Silva J; Grupo de Resistencia Bacteriana.Andrade V, et al. Among authors: silva j.Salud Publica Mex. 2004 Nov-Dec;46(6):524-8. doi: 10.1590/s0036-36342004000600007.Salud Publica Mex. 2004.PMID: 15624856Spanish.