1. Wellcome Trust-MRC Institute of Metabolic Science; University of Cambridge; Cambridge UK
2. Department of Diabetes & Endocrinology; Cambridge University Hospitals NHS Foundation Trust; Cambridge UK
3. Department of Diabetes & Endocrinology; Clinical Nutrition and Metabolism, Inselspital; Bern University Hospital; University of Bern; Bern Switzerland
4. Department of Paediatrics; University of Cambridge; Cambridge UK
5. Department of Internal Medicine; Division of Endocrinology & Diabetology; Medical University of Graz; Graz Austria
6. Profil Institut fuer Stoffwechselforschung GmbH; Neuss Germany
7. Central Manchester University Hospitals NHS foundation Trust and University of Manchester; Manchester UK