1. Wellcome Trust–MRC Institute of Metabolic Science, University of Cambridge, Cambridge, U.K.
2. Department of Paediatrics, University of Cambridge, Cambridge, U.K.
3. Department of Diabetes and Endocrinology, Cambridge University Hospitals National Health Service Foundation Trust, Cambridge, U.K.
4. Profil, Neuss, Germany
5. Division of Endocrinology and Metabolism, Department of Internal Medicine, Medical University of Graz, Graz, Austria