1. National Institute for Health Research Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, UK
2. Centre for Antimicrobial Optimisation, Hammersmith Hospital, Imperial College London, Du Cane Road, London W12 0NN, UK
3. Imperial College Healthcare NHS Trust, Hammersmith Hospital, Du Cane Road, London W12 0HS, UK
4. Chelsea & Westminster NHS Foundation Trust, 369 Fulham Road, London SW10 9NH, UK
5. Public Health England, National Infection Service, 61 Colindale Avenue, London NW9 5EQ, UK