1. University College London Medical School, London WC1E 6BT, UK
2. North Manchester General Hospital, Pennine Acute Hospitals NHS Trust, Manchester M8 5RB, UK
3. Diabetic Foot Clinic, Elsie Bertram Diabetes Centre, Norfolk and Norwich University Hospitals NHS Foundation Trust, Norwich NR4 7UY, UK
4. Norwich Medical School, University of East Anglia, Norwich NR4 7TJ, UK