1. T8, University College London Hospitals, London NW1 8BU
2. Research Department of Infection and Population Health, Division of Population Health, Royal Free and University College London Medical School, University College London, London WC1E 6JB, UK
3. Department of Histopathology, University College London Hospitals, London WC1E 6JJ
4. Department of Imaging, University College London Hospitals, London NW1 8BU, UK