1. Department of Colorectal Surgery, Queen Alexandra Hospital, Portsmouth, UK
2. Department of Surgery and Endoscopy, Care UK North East London Treatment Centre, King Georges Hospital, Ilford, UK
3. Department of Gastroenterology, Queen Alexandra Hospital, Portsmouth, UK
4. Department of Surgery and Endoscopy, University of Portsmouth, Portsmouth, UK
5. Department of Radiology, Queen Alexandra Hospital, Portsmouth, UK
6. Department of Surgery and Endoscopy, University of Southampton, Southampton, UK