1. Academic Endocrine Unit (S.M.M., M.R.B., M.A.N., R.V.T.), Churchill Hospital, Oxford, OX3 7LJ, United Kingdom;
2. Nuffield Department of Clinical Medicine, Oxford Centre for Diabetes, Endocrinology, and Metabolism, University of Oxford, and Oxford Medical Genetics Laboratories (T.C., C.F.), Churchill Hospital, Oxford, OX3 7LJ, United Kingdom;
3. Department of Paediatric Endocrinology (J.A.), The Royal London Hospital, London E1 1BB, United Kingdom;
4. Department of Paediatric Endocrinology (J.A., C.B.), Great Ormond Street Hospital, London WC1A 9JH, United Kingdom