1. Paediatric Epidemiology Group, Leeds General Infirmary Leeds, U.K
2. Centre for Health Services Research and the Division of Public Health, Leeds General Infirmary Leeds, U.K
3. Nuffield Institute for Health, University of Leeds Leeds Department of Public Health Services, Leeds General Infirmary Leeds, U.K
4. The Medical School, University of Edinburgh Edinburgh Department of Public Health and Epidemiology, Leeds General Infirmary Leeds, U.K
5. Institute of Public and Environmental Health, University of Birmingham Birmingham Diabetes Centre, Leeds General Infirmary Leeds, U.K