1 Chelsea and Westminster Hospital NHS Foundation Trust, 369 Fulham Road, London SW10 9NH, UK.
2 Imperial College Healthcare NHS Trust, Fulham Palace Road, London W6 8RF, UK.
3 London North West University Healthcare NHS Trust, London, UK.
4 Chelsea and Westminster Hospital NHS Foundation Trust, 369 Fulham Road, London SW10 9NH, UK; Imperial College Healthcare NHS Trust, Fulham Palace Road, London W6 8RF, UK; Imperial College London, NIHR Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, 8th Floor Commonwealth Building, Du Cane Road, W12 0NN, UK.
5 Chelsea and Westminster Hospital NHS Foundation Trust, 369 Fulham Road, London SW10 9NH, UK. Electronic address: rachaeljones@nhs.net.