1 Department of Gastroenterology, Chelsea and Westminster Hospital, London, UK [email protected].
2 Department of Surgery, North Middlesex University Hospital, London.
3 Department of Gastroenterology, Chelsea and Westminster Hospital, London, UK Department of Surgery, North Middlesex University Hospital, London Department of Pathology, West Middlesex University Hospital, London Department of Gastroenterology, West Middlesex University Hospital.
4 Department of Pathology, West Middlesex University Hospital, London.
5 Department of Gastroenterology, West Middlesex University Hospital.