1. Department of Endocrinology and Metabolism, Pilgrim Hospital, United Lincolnshire Hospitals NHS Trust, Boston PE21 9QS, UK
2. Department of Endocrinology and Metabolism, Lancashire Teaching Hospitals NHS Trust, Royal Preston Hospital, Sharoe Green Lane, Preston PR2 9HT, UK
3. Department of Family Medicine and Polyclinics, King Faisal Specialist Hospital & Research Centre, Riyadh 11211, Saudi Arabia
4. University Diabetes Center, King Saud University Medical City, King Saud University, Riyadh 11411, Saudi Arabia
5. Faculty of Science, Manchester Metropolitan University, Manchester M15 6BH, UK
6. Faculty of Biology, Medicine & Health, The University of Manchester, Manchester M13 9PL, UK