Affiliation: | 1. Metabolic Research Laboratories, Wellcome Trust – Medical Research Council Institute of Metabolic Science, University of Cambridge, Cambridge CB2 0QQ, UK;2. Wellcome Trust – Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Cambridge CB2 0AW, UK;3. Wolfson Diabetes and Endocrine Clinic, Cambridge University Hospitals NHS Foundation Trust, Cambridge CB2 0QQ, UK |