1. Departments of Endocrinology and Diabetes (W.H., N.S., T.B.), B4 6NH Birmingham, United Kingdom;
2. Department of Paediatric Endocrinology and Diabetes (D.D.M.), University Children's Hospital, D-72074 Tübingen, Germany;
3. Nuclear Medicine (N.C.), Birmingham Children's Hospital, B4 6NH Birmingham, United Kingdom;
4. Wellcome Trust Clinical Research Facility (P.N.), Queen Elizabeth Hospital, Birmingham B15 2TH, United Kingdom;
5. School of Clinical and Experimental Medicine (J.T., T.B.), University of Birmingham, Birmingham B15 2TT, United Kingdom;
6. William Harvey Research Institute (L.M.), Barts and the London School of Medicine, Queen Mary University of London, London E1 1BB, United Kingdom;
7. Department of Paediatrics (R.R.), Oregon Health Sciences University, Portland, Oregon 97239;
8. Department of Paediatrics (S.R.), Heartlands Hospital, B9 5SS Birmingham, United Kingdom;
9. Department of Paediatrics (J.W.), Portsmouth Hospital, Portsmouth PO6 3LY, United Kingdom;
10. Medical Research Laboratory (J.F.), Department of Clinical Medicine, Faculty of Health, Aarhus University, and Department of Endocrinology and Internal Medicine, Aarhus University Hospital, DK-8000 C Aarhus, Denmark