1. University of Leeds; Gastroenterology; Room 190A, B Floor Clarendon Wing, LGI Leeds West Yorkshire UK LS1 3EX
2. St James University Hospital; Gastroenterology; Beckett Street Leeds UK LS9 7TF
3. McMaster University; Department of Medicine, Division of Gastroenterology; Room 4W8E 1200 Main Street West Hamilton Ontario Canada L8N 3Z5
4. Queen Elizabeth Hospital; Gastroenterology Unit; Edgbaston Birmingham UK B15 2TH