1. Royal Centre for Defence Medicine, National Institute of Health Research, Surgical Reconstruction and Microbiology Research Centre (NIHR SRMRC), Queen Elizabeth Medical Centre, Edgbaston, Birmingham B15 2TH, UK.
2. Royal Centre for Defence Medicine, Queen Elizabeth Medical Centre, Edgbaston, Birmingham B15 2TH, UK.
3. Royal Centre for Defence Medicine, Plymouth Hospitals NHS Trust, Derriford Road, Crownhill, Plymouth, Devon, PL6 8DH, UK.