1. Department of Diabetes and Endocrinology, Ipswich Hospital NHS Trust, Heath Road, Ipswich, IP4 5PD, UK,
2. Elsie Bertram Diabetes Centre, Norfolk and Norwich University Hospital NHS Trust, Norwich, United Kingdom, NR4 7UY, UK
3. Peterborough and Stamford NHS Foundation Trust, Peterborough, PE3 6DA, UK