1. Department of Oncology & Metabolism, University of Sheffield , Sheffield S10 2RX , UK
2. Department of Paediatric Endocrinology and Diabetes, Leeds Children's Hospital , Leeds LS2 3AX , UK
3. Department of Paediatric Endocrinology, Great North Children's Hospital, University of Newcastle , Newcastle NE1 4LP , UK
4. Department of Paediatric Endocrinology & Diabetes, Bristol Royal Hospital for Children, University Hospitals Bristol Foundation Trust , Bristol BS2 8BJ , UK
5. Department of Paediatric Endocrinology, Alder Hey Children's Hospital , Liverpool L14 5AB , UK
6. Department of Paediatric Endocrinology and Diabetes, Great Ormond Street Hospital , London WC1N 1LE , UK
7. Department of Paediatric Endocrinology, University Hospital Southampton , Southampton SO16 6YD , UK
8. Department of Human Development & Health, University of Southampton , Southampton SO17 1BJ , UK
9. Centre for Endocrinology, William Harvey Research Institute, Queen Mary University London, London and Barts Health NHS Trust—The Royal London Hospital , London E1 1BB , UK
10. Department of Paediatric Endocrinology, Birmingham Women's & Children's Hospital , Birmingham B4 6NH , UK
11. Paediatric Endocrine Service, Royal Manchester Children's Hospital, Manchester University NHS Foundation Trust , Manchester M13 9WL , UK
12. Department of Paediatric Diabetes and Endocrinology, Nottingham Children's Hospital , Nottingham NG7 2UH , UK
13. Department of Paediatric Endocrinology and Diabetes, Oxford Children's Hospital, Oxford University Hospitals NHS Foundation Trust , Oxford OX3 9DU , UK
14. Department of Biochemistry, Manchester University NHS Foundation Trust , Manchester M13 9PL , UK
15. Developmental Endocrinology Research Group, University of Glasgow , Glasgow G12 8QQ , UK