1. London Centre for Paediatric Endocrinology (V.B.A., K.H.), Great Ormond Street Hospital for Children National Health Service Foundation Trust, London WC1N 3JH, United Kingdom
2. The Institute of Child Health (V.B.A., K.H.), University College London, London WC1N 1EH, United Kingdom
3. Institute of Biomedical and Clinical Science (S.E.F., S.E.), University of Exeter Medical School, Exeter EX2 5DW, United Kingdom
4. Department of Pediatrics (E.S., B.R.-M.), Medical University of Vienna, 1090 Vienna, Austria