1. GenesisCare, Oxford OX4 6LB, UK
2. Department of Radiotherapy and Oncology, Oxford University Hospitals NHS Foundation Trust, Oxford OX3 7LE, UK
3. Department of Oncology, Royal Derby Hospital, Derby DE22 3NE, UK
4. Department of Oncology, Royal Berkshire Hospital, Reading RG1 5AN, UK
5. Department of Oncology, University Hospitals Birmingham, Birmingham B15 2GW, UK
6. Department of Oncology, Royal Surrey NHS Foundation Trust, Guildford GU2 7XX, UK