1. Department of Medicine, Grantham and District Hospital, NG31 8DG East Midlands, UK
2. Department of Medicine, Singapore General Hospital, Singapore 169608
3. Department of Diabetes and Endocrinology, The Royal Infirmary of Edinburgh, Edinburgh, UK
4. Department of Diabetes and Endocrinology, Lincoln County Hospital, LN2 5QY East Midlands, UK