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Nemoy, LL and Kotetishvili, M and Tigno, J and Keefer-Norris, A and Harris, AD and Perencevich, EN and Johnson , JA and Torpey, D and Sulakvelidze, A and Morris, JG Jr and Stine, OC (2005) Multilocus sequence typing versus pulsed-field gel electrophoresis for characterization of extended-spectrum beta-lactamase-producing Escherichia coli isolates. J Clin Microbiol.