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Petrikkos G, Markogiannakis A, Papaparaskevas J, Papapareskevas J, Daikos GL, Stefanakos G, Zissis NP, Avlamis A. Differences in the changes in resistance patterns to third- and fourth-generation cephalosporins and piperacillin/tazobactam among Klebsiella pneumoniae and Escherichia coli clinical isolates following a restriction policy in a Greek tertiary care hospita. Int J Antimicrob Agents. 2007;29(1):34-8.\par \par }