1 Department of Diabetes and Endocrinology, North Bristol NHS Trust, Southmead Hospital, Southmead Road, Westbury-on-Trym, Bristol, BS10 5NB, UK. jude_hancock@hotmail.com.
2 Department of Diabetes and Endocrinology, North Bristol NHS Trust, Bristol, UK. jude_hancock@hotmail.com.
3 University of the West of England, Bristol, UK.
4 Department of Diabetes and Endocrinology, North Bristol NHS Trust, Bristol, UK.