1. Department of Metabolism, Digestion and Reproduction, Imperial College, London, UK
2. Royal College of Surgeons in Ireland (RCSI) University of Medicine and Health Sciences, Dublin, Ireland
3. University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
4. Birmingham Quality (UK NEQAS), University Hospitals NHS Foundation Trust, Birmingham, UK
5. Department of Biochemistry, Royal Hallamshire Hospital, University of Sheffield Medical School, Sheffield, UK
6. Department of Clinical Biochemistry, Black Country Pathology Services, Walsall Manor Hospital, Walsall, UK
7. School of Medicine and Clinical Practice, Faculty of Science & Engineering, The University of Wolverhampton, Wolverhampton, UK
8. Department of Clinical Biochemistry, Bristol Royal Infirmary, Bristol, UK
9. Department of Urology, Spire Hospital Little Aston, Birmingham, UK
10. Department of Clinical Biochemistry, University Hospitals Birmingham NHS Foundation Trust, West Midlands, UK
11. Oxford Centre for Diabetes, Endocrinology & Metabolism, University of Oxford, Oxford, UK
12. Porthcawl Medical Centre & Department of Urology, Princess of Wales Hospital, Bridgend, UK
13. Department of Blood Sciences, Royal Victoria Infirmary, Newcastle upon Tyne, UK
14. Great Western Hospital NHS Foundation Trust, Swindon, UK
15. Bedfordshire Hospitals NHS Foundation Trust, Luton, UK
16. Division of Endocrinology, Diabetes & Gastroenterology, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
17. Department of Endocrinology, Diabetes & Metabolism, Newcastle-upon-Tyne Hospitals NHS Foundation Trust & Translational & Clinical Research Institute, University of Newcastle-upon-Tyne, Newcastle Upon Tyne, UK