1. Gray Laboratory, Department of Oncology, University of Oxford, Oxford, UK;
2. Green Templeton College, University of Oxford, Oxford, UK;
3. Wellcome/EPSRC Centre for Interventional and Surgical Sciences, Department Medical Physics and Biomedical Engineering, University College London, London, UK;
4. Centre for Medical Image Computing, Department Medical Physics and Biomedical Engineering, University College London, London, UK;
5. School of Biomedical Engineering and Imaging Sciences, King’s College London, London, UK