1. National Infection Service, Public Health England, London NW9 5EQ, UK
2. Imperial College Healthcare NHS Trust, North West London Pathology, Hammersmith Hospital, Du Cane Road, London W12 0HS, UK
3. Department of Microbiology, Kings College Hospital NHS Foundation Trust, Denmark Hill, London SE5 9RS, UK
4. Independent Researcher, London NW9 0TA, UK
5. Specialist Antimicrobial and Chemotherapy Unit, Public Health Wales, University Hospital of Wales, Heath Park, Cardiff, CF14 4XW, UK