1. Veterans Administration Western New York Healthcare System, University at Buffalo, Buffalo, New York, USA
2. Department of Medicine, University at Buffalo, Buffalo, New York, USA
3. Department of Microbiology and Immunology, University at Buffalo, Buffalo, New York, USA
4. The Witebsky Center for Microbial Pathogenesis, University at Buffalo, State University of New York, Buffalo, New York, USA
5. Department of Biostatistics and Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, New York, USA
6. Multidrug-Resistant Organism Repository and Surveillance Network (MRSN), Walter Reed Army Institute of Research, Silver Spring, Maryland, USA
7. Division of Healthcare Quality Promotion, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia, USA