1. Biochemistry, Endocrinology, and Metabolism Unit (D.E.G.M., J.P.T., D.K., K.S.W., M.T.D.), Institute of Child Health, London WC1N 1EH, United Kingdom
2. Université Paris-Descartes, Assistance Publique Hopitaux de Paris, Hôpital Bicêtre (R.B.), 94275 Le Kremlin Bicêtre, France
3. Third Department of Pediatrics (A.P.), University of Athens School of Medicine, Athens, Greece
4. Hospital for Children and Adolescents (E.K., A.K.), University of Leipzig, Leipzig, Germany
5. Charite (N.H., H.K.), Institute of Experimental Pediatric Endocrinology, Augustenburgerplatz 1, D-13353 Berlin, Germany
6. Department of Endocrinology (S.M.S.), Christie Hospital National Health Service Trust, Manchester, United Kingdom