University College London - Institute of Health Informatics, University College London - Institute of Health Informatics, University College London - Institute of Health Informatics, University College London - Institute of Health Informatics, University College London, University of Southampton, Government of the United Kingdom - Office for National Statistics, London School of Hygiene & Tropical Medicine - Faculty of Epidemiology and Population Health, University College London - Institute of Health Informatics, University College London, The University of Manchester, Government of the United Kingdom - Barts Health NHS Trust, Health Data Research UK, University of Leicester - Leicester Diabetes Centre, University College London - Institute of Health Informatics and Independent