Department of Diabetes and Endocrinology, Morriston Hospital, Swansea, SA6 8NL, UK; Diabetes Research Group, School of Medicine, Swansea University, Swansea, SA2 8PP, UK. Data Science, Swansea University, Swansea, SA2 8PP, UK. Hywel Dda University Health Board, Diabetes Centre, Prince Philip Hospital,Llanelli, SA14 8QF, UK. Renal Unit, Morriston Hospital, Swansea, SA6 6NL, UK. Department of Diabetes and Endocrinology, Morriston Hospital, Swansea, SA6 8NL, UK; Diabetes Research Group, School of Medicine, Swansea University, Swansea, SA2 8PP, UK. Electronic address: J.W.Stephens@Swansea.ac.uk.