1. Diabetes Research Laboratories, Oxford Centre for Diabetes, Endocrinology and Metabolism, Churchill Hospital, Oxford, U.K
2. Wellcome Trust Centre for Human Genetics, Headington, Oxford, U.K
3. Department of Diabetes Research and Vascular Medicine, Peninsula Medical School, Exeter, U.K
4. Department of Diabetes and Metabolic Medicine, Barts and the London, Queen Mary School of Medicine and Dentistry, University of London, London, U.K
5. Department of Medicine, School of Medicine, Newcastle University, Newcastle upon Tyne, U.K