1. McMaster University; Department of Medicine, Division of Gastroenterology; 1200 Main Street West Room 4W8E Hamilton Ontario Canada L8N 3Z5
2. South Tyneside District Hosiptal; Department of Medicine/Gastroenterology; Harton Lane South Shields UK NE34 0PL
3. University of Birmingham; Public Health, Epidemiology and Biostatistics; Edgbaston Birmingham UK B15 2TT
4. King's College London; Division of Health and Social Care Research; 7th Floor Capital House 42 Weston Street London UK SE1 3QD
5. Kent and Sussex Hospital; GI Department; Tunbridge Wells Kent UK TN4 8AT
6. The University of Birmingham; Department of Primary Care and General Practice; The Medical School Edgbaston Birmingham UK B15 2TT
7. The Medical School; Department of General Practice; University of Birmingham Edgbaston Birmingham West Midlands UK B15 2TT
8. The Medical School; Dept of Primary Care and General Practice; The University of Birmingham Edgbaston Birmingham UK B15 2TT
9. The University of Birmingham; Department of General Practice; The Medical School Birmingham UK B15 2TT
10. Queen's University; School of Sociology, Social Policy and Social Work; Belfast Northern Ireland UK BT7 1LP
11. International Agency for Research on Cancer; 150 cours Albert-Thomas Lyon France 69372