1. Centre for Endocrinology (A.D., C.C.-H., F.M.-M., S.A.A., A.J.L.C., M.O.S., L.A.M.), William Harvey Research Institute, Barts and the London, Queen Mary, University of London, London EC1M 6BQ, United Kingdom
2. Pediatric Endocrinology Division (A.B., S.T.), Infant’s and Children’s Hospital of Brooklyn at Maimonides, Brooklyn, New York 11219
3. Department of Paediatrics (S.J.R.), Heartlands Hospital, Birmingham B9 5SS, United Kingdom
4. Department of Paediatrics (G.E.B.), Leeds General Infirmary, Leeds LS1 3EX, United Kingdom
5. Endocrine Science Research Group (P.E.C.), School of Medicine, University of Manchester, Manchester M13 9PT, United Kingdom