1. Department of Oncology and Metabolism, University of Sheffield , Sheffield, UK
2. Leeds General Infirmary , Leeds, UK
3. Great North Children's Hospital, University of Newcastle , Newcastle, UK
4. Bristol Royal Hospital for Children, University Hospitals Bristol Foundation Trust , Bristol, UK
5. Alder Hey Children's Hospital , Liverpool, UK
6. Great Ormond Street Hospital , London, UK
7. University Hospital Southampton , Southampton, UK
8. Southampton, United Kingdom University of UK
9. Centre for Endocrinology, William Harvey Research Institute, Queen Mary University London, London and Barts Health NHS Trust – The Royal London Hospital , London, UK
10. Birmingham Women's & Children's Hospital , Birmingham, UK
11. Developmental Endocrinology Research Group, University of Glasgow , Glasgow, UK
12. Paediatric Endocrine Service, Royal Manchester Children's Hospital, Manchester University NHS Foundation Trust , Manchester, UK
13. Nottingham Children's Hospital , Nottingham, UK
14. Oxford Children's Hospital, Oxford University Hospitals NHS Foundation Trust , Oxford, UK
15. Department of Biochemistry, Manchester University NHS Foundation Trust , Manchester, UK