1. Department of Endocrinology (A.D., L.A.M., A.J.L.C., M.O.S.), William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, London EC1M 6BQ, United Kingdom;
2. Department of Pediatrics (V.H., R.G.R.), Oregon Health and Science University, Portland, Oregon 97239;
3. Hôpital Armand-Trousseau (I.N.), Explorations Fonctionnelles Endocriniennes, 75012 Paris, France;
4. Université Pierre et Marie Curie (I.N.), 75005 Paris, France;
5. Institut National de la Santé et de la Recherche Médicale (I.N.), Unité 938, Team 4, 75012 Paris, France;
6. Karolinska Institute (C.C.-H.), 171 65 Stockholm, Sweden