1 Infection Clinical Academic Group, St George's Hospital NHS Foundation Trust, London, UK; Centre of Defence Pathology, Royal Centre for Defence Medicine, Queen Elizabeth Hospital Birmingham, Birmingham B15 2WB, UK. Electronic address: scott.pallett@nhs.net.
2 Department of Trauma and Orthopaedics, St George's Hospital NHS Foundation Trust, London, UK.
3 Infection Clinical Academic Group, St George's Hospital NHS Foundation Trust, London, UK.
4 Chelsea and Westminster NHS Foundation Trust, London, UK; NIHR Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Imperial College London, London, UK.
5 Infection Clinical Academic Group, St George's Hospital NHS Foundation Trust, London, UK; NIHR Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Imperial College London, London, UK; Antimicrobial Pharmacodynamics and Therapeutics, Department of Molecular and Clinical Pharmacology, University of Liverpool, Liverpool, UK.