1 RM CTU, National Institute for Health & Care Research (NIHR) Biomedical Research Centre at the Royal Marsden NHS Foundation Trust and the Institute of Cancer Research, London, UK. catey.bunce@rmh.nhs.uk.
2 Moorfields Eye Hospital NHS Foundation Trust, London, England. catey.bunce@rmh.nhs.uk.
3 Faculty of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine, London, England. catey.bunce@rmh.nhs.uk.
4 Moorfields Eye Hospital NHS Foundation Trust, London, England.