1. Nuffield Department of Medicine, University of Oxford, Oxford, UK
2. NIHR Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance at University of Oxford in partnership with Public Health England, Oxford, UK
3. Department of Microbiology & Infectious Diseases, Concord Repatriation General Hospital, Sydney, Australia
4. University of Sydney, Sydney, Australia
5. NIHR Oxford Biomedical Research Centre, University of Oxford/Oxford University Hospitals NHS Foundation Trust, Oxford, UK
6. Division of Infectious Diseases and International Health, University of Virginia, Charlottesville, VA, USA