1. Centre for Population Health Sciences; University of Edinburgh; Edinburgh UK
2. Clinical Trials Research Unit; University of Sheffield; Sheffield UK
3. The Sheffield Diabetes and Endocrine Centre; Northern General Hospital; Sheffield UK
4. Department of Diabetes; Royal Infirmary of Edinburgh; Edinburgh UK
5. Department of General Practice; University College Cork; Ireland
6. Unit of Diabetes, Endocrinology and Metabolism; University of Sheffield; Sheffield UK