1. Wellcome/Engineering and Physical Sciences Research Council Centre for Interventional and Surgical Sciences. University College London , London , UK
2. UCL Division of Surgery and Interventional Science, University College London , London , UK
3. Peter MacCallum Cancer Centre , Melbourne, Victoria , Australia
4. Department of General and Colorectal Surgery, University Hospital Limerick , Limerick , Ireland
5. Department of General Surgery, Swansea Bay University Health Board , Swansea , UK
6. Department of General Surgery, University College London Hospitals NHS Foundation Trust , London , UK