1. 1Leeds Cancer Research UK Clinical Trials Unit, Leeds Institute of Clinical Trials Research, University of Leeds, Leeds, United Kingdom.
2. 2Clinical Trials Unit Glasgow, University of Glasgow, Glasgow, United Kingdom.
3. 3Clinical Trials and Statistics Unit, The Institute of Cancer Research, London, United Kingdom.
4. 4Centre for Trials Research, Cardiff University, Cardiff, United Kingdom.
5. 5Cancer Research UK Cambridge Centre, Cambridge, United Kingdom.
6. 6University College Hospital, London, United Kingdom.
7. 7Radiotherapy Research Group, Leeds Institute of Medical Research at St James's, Faculty of Medicine and Health, University of Leeds, Leeds, United Kingdom.
8. 8Centre for Trials Research, Cardiff University and Velindre Cancer Centre, Cardiff, United Kingdom.