1. Department of Statistics, University of Warwick , Coventry, CV4 7AL, United Kingdom
2. University of Birmingham , Edgbaston, Birmingham, B15 2TT, United Kingdom
3. Warwick Medical School, University of Warwick , Coventry, CV4 7AL, United Kingdom
4. Screening Quality Assurance Service , NHS England, Birmingham, B2 4BH, United Kingdom
5. Peel & Schriek Consulting Ltd , London, NW3 4QG, United Kingdom
6. School of Cancer & Pharmaceutical Sciences, King’s College London , London, WC2R 2LS, United Kingdom
7. Comprehensive Cancer Centre at Guy’s Hospital, Guy’s and St Thomas’ NHS Foundation Trust , London, SE1 9RT, United Kingdom
8. St George’s University Hospitals NHS Foundation Trust , London, SW17 0QT, United Kingdom
9. Oxford Breast Imaging Centre, Churchill Hospital , Oxford, OX3 7LE, United Kingdom
10. Cambridge Breast Unit and NIHR Cambridge Biomedical Research Centre, Cambridge University Hospitals NHS Trust , Cambridge, CB2 0QQ, United Kingdom