1. St. James's University Hospital; Leeds Gastroenterology Unit; Beckett Street Leeds UK LS9 7TF
2. Royal Free Campus, UCL Medical School; Department of Surgery; Royal Free Hospital Rowland Hill Street London UK NW3 2PF
3. King's College London; Division of Health and Social Care Research; 7th Floor Capital House 42 Weston Street London UK SE1 3QD
4. International Agency for Research on Cancer; 150 cours Albert-Thomas Lyon France 69372
5. McMaster University; Department of Medicine, Division of Gastroenterology; 1200 Main Street West Room 4W8E Hamilton ON Canada L8N 3Z5