1 Department of Gastroenterology (Anenta Ratneswaren, Faidon-Marios Laskaratos), Queen's Hospital, Barking Havering and Redbridge University Hospitals NHS Trust, Romford, London, UK.
2 Clinical Diagnostic Unit (Ayyakannu Kumar), Queen's Hospital, Barking Havering and Redbridge University Hospitals NHS Trust, Romford, London, UK.
3 Department of Colorectal Surgery (Clive Hepworth), Queen's Hospital, Barking Havering and Redbridge University Hospitals NHS Trust, Romford, London, UK.