1. 1Senior House Officer, Doncaster Royal Infirmary, DN2 5LT, Doncaster, UK
2. 2Specialist Registrar, Doncaster Royal Infirmary, DN2 5LT, Doncaster, UK
3. 3Consultant Radiologist, Doncaster Royal Infirmary, DN2 5LT, Doncaster, UK
4. 4Consultant Histopathologist, Doncaster Royal Infirmary, DN2 5LT, Doncaster, UK
5. 5Consultant General and Colorectal Surgeon, Doncaster Royal Infirmary, DN2 5LT, Doncaster, UK