1. Developmental Endocrinology Research Group (R.P., D.K., P.C.H., M.T.D.), University College London Institute of Child Health and Great Ormond Street Hospital for Children, London WC1N 1EH, United Kingdom
2. Department of Endocrinology (M.P.), Royal Free Hampstead National Health Service Trust, London NW3 2QG, United Kingdom
3. Department of Paediatric Endocrinology (M.A.-K.), Al Amiri Hospital, Safat 13041, Kuwait