1 National Institute for Health Research Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Imperial College London, Hammersmith Campus, London, United Kingdom.
2 Centre for Antimicrobial Optimisation, Imperial College London, Hammersmith Campus, London, United Kingdom.
3 Department of Infectious Diseases, Imperial College London, South Kensington Campus, South Kensington, United Kingdom.
4 Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, United Kingdom.
5 Chelsea and Westminster NHS Foundation Trust, London, United Kingdom.