1. University College London Institute of Child Health (L.L., M.T.D., J.C.A.), University College London, London WC1N 1EH, United Kingdom
2. the Department of Medicine (L.L., J.C.A.), University College London, London WC1N 1EH, United Kingdom
3. Cerrahpasa Medical Faculty (O.E.), University of Istanbul, 34303 Istanbul, Turkey
4. Department of Endocrinology (J.R.), National Institute of Child Health, Karachi 75520, Pakistan
5. Bristol Royal Hospital for Children (C.P.B.), Bristol BS2 8BJ, United Kingdom
6. Academic Department of Obstetrics and Gynaecology (S.M.C.), University College London, London WC1N 1EH, United Kingdom
7. Division of Endocrinology and Metabolism (R.J.A.), University of Texas Southwestern Medical Center, Dallas, Texas 75390-8857