Risk Factors for Gastrointestinal Tract Colonization with Extended-Spectrum <i>β</i>-Lactamase (ESBL)–Producing <i>Escherichia coli</i> and <i>Klebsiella</i> Species in Hospitalized PatientsJennifer Han, Ebbing Lautenbach, Mark G. Weiner et al.|Infection Control and Hospital Epidemiology|2012Cited by 21