1 Leicester Real World Evidence Unit, Leicester Diabetes Centre, University of Leicester, Leicester, UK.
2 Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK.
3 Division of Primary Care, School of Medicine, University of Nottingham, Nottingham, UK.
4 Department of Medicine, University of Toronto; Division of Endocrinology, Sunnybrook Health Sciences Centre, Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada.
5 Cancer Research UK Oxford Centre, University of Oxford, Oxford, UK.
6 Primary Care Unit, School of Clinical Medicine, University of Cambridge, Cambridge, UK.
7 MRC Epidemiology Unit, School of Clinical Medicine, University of Cambridge, Cambridge, UK.
8 Primary Care Research Centre, University of Southampton, Southampton, UK.