1 Department of Nuclear Medicine, Guy's and St Thomas' NHS Foundation Trust, London, UK. Hajira.Ilyas@gstt.nhs.uk.
2 Department of Clinical Oncology, Guy's and St Thomas' NHS Foundation Trust, London, UK.
3 Kings College London and Guy's and St Thomas' PET Centre, School of Biomedical Engineering and Imaging Science, King's College London, King's Health Partners, London, UK.
4 Department of Cancer Epidemiology and Population Health, King's College London, King's Health Partners, London, UK.