1. Cambridge University Hospitals National Health Service Foundation Trust, Cambridge, United Kingdom
2. Department of Surgery and Cancer, Imperial College London, London, United Kingdom
3. Imperial Clinical Trials Unit, School of Public Health, Imperial College London, London, United Kingdom
4. Department of Applied Economics, University of Granada, Granada, Spain
5. Institute of Cardiovascular Sciences, University of Birmingham, Birmingham, United Kingdom
6. Gloucestershire Hospitals National Health Service Foundation Trust, Cheltenham, United Kingdom
7. Medical Research Council Population Health Research Unit, Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom
8. Clinical Trial Service Unit and Epidemiological Studies Unit, Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom
9. University of Manchester & Manchester University National Health Service Foundation Trust, Manchester, United Kingdom
10. Worcestershire Acute Hospitals National Health Service Trust, Worcestershire, United Kingdom
11. North West London Hospitals National Health Service Trust, London, United Kingdom
12. Warwick Clinical Trials Unit, University of Warwick, Warwick, United Kingdom