1. Department of Colorectal Surgery, Portsmouth Hospitals University NHS Trust, Portsmouth PO6 3LY, UK
2. School of Computing, Faculty of Technology, University of Portsmouth, Portsmouth PO1 2UP, UK
3. Department of Paediatric Surgery, University Hospital Southampton NHS Foundation Trust, Southampton SO16 6YD, UK
4. Faculty of Science and Health, University of Portsmouth, Portsmouth PO1 2UP, UK