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