1. Radiation Physics and Protection, Churchill Hospital, Oxford University Hospitals NHS Foundation Trust, Oxford, OX3 7LE, United Kingdom.
2. Department of Nuclear Medicine, Royal Surrey County Hospital NHS Foundation Trust, Guildford, United Kingdom.
3. Department of Radiology, Churchill Hospital, Oxford University Hospitals NHS Foundation Trust, Oxford, United Kingdom.
4. Department of Oncology, University of Oxford, Oxford, United Kingdom.