1. Department of Medical StatisticsLondon School of Hygiene and Tropical MedicineLondon UK
2. Department of Health Services Research and PolicyLondon School of Hygiene and Tropical MedicineLondon UK
3. Department of Non‐Communicable Disease EpidemiologyLondon School of Hygiene and Tropical MedicineLondon UK
4. MRC Clinical Trials Unit at UCLInstitute of Clinical Trials and MethodologyLondon UK
5. Health Data Research UKLondon UK