1. Developmental Endocrinology Research Group (S.M.P.O., P.C.H.), Institute of Child Health, University College London, London WC1N 1EH, United Kingdom
2. The National Centre for Medical Genetics (S.M.P.O., S.A.L.), Crumlin, Dublin 12, Ireland
3. Our Lady’s Children’s Hospital (S.M.P.O., S.A.L., C.C.), Crumlin, Dublin 12, Ireland
4. Centre for Endocrinology (L.F.C., A.J.L.C.), Barts & London, Queen Mary, University of London, London E1 1BB, United Kingdom