1. Division of Infectious Diseases and International Health, Department of Medicine, University of Virginia Health System, Charlottesville, Virginia, USA
2. Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
3. National Institute for Health Research Health Protection Research Unit in Healthcare Associated Infection and Antimicrobial Resistance, University of Oxford, Oxford, United Kingdom
4. School of Medicine, University of Virginia, Charlottesville, Virginia, USA
5. Clinical Microbiology Laboratory, Department of Pathology, University of Virginia Health System, Charlottesville, Virginia, USA