1 Diabetes Trials Unit, Churchill Hospital, University of Oxford, Oxford, Headington OX3 7LJ, UK. Electronic address: rury.holman@dtu.ox.ac.uk.
2 Diabetes Trials Unit, Churchill Hospital, University of Oxford, Oxford, Headington OX3 7LJ, UK; Division of Endocrinology and Metabolism, Medical University of Graz, Graz, Austria.
3 Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC, USA.