1. South Tyneside District Hosiptal; Department of Medicine/Gastroenterology; Harton Lane South Shields UK NE34 0PL
2. McMaster University; Department of Medicine, Division of Gastroenterology; 1200 Main Street West Room 4W8E Hamilton Ontario Canada L8N 3Z5
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. St Joseph's Hospital; Department of Psychiatry; Hamilton Ontario Canada
6. International Agency for Research on Cancer; 150 cours Albert-Thomas Lyon France 69372