1. Wellcome-MRC Institute of Metabolic Science, Metabolic Research Laboratories, University of Cambridge, Cambridge, United Kingdom.
2. Department of Diabetes, Royal Free London NHS Foundation Trust, London, United Kingdom.
3. Cambridge University Hospitals NHS Foundation Trust, Wolfson Diabetes and Endocrine Clinic, Cambridge, United Kingdom.
4. Institute of Primary Health Care (BIHAM), University of Bern, Bern, Switzerland.
5. Department of Paediatrics, University of Cambridge, Cambridge, United Kingdom.