1. Centre for Cancer Screening, Prevention and Early Diagnosis, Wolfson Institute of Population Health Queen Mary University of London London UK
2. Department of Applied Health Research University College London London UK
3. Department of Radiology Oxford University Hospitals NHS Foundation Trust Oxford UK
4. Department of Behavioural Science and Health University College London London UK
5. Nuffield Department of Primary Care Health Sciences University of Oxford Oxford UK
6. Department of Cancer Care, School of Health Sciences University of Surrey Guildford UK