1. King's College London; Division of Health and Social Care Research; 7th Floor Capital House 42 Weston Street London UK SE1 3QD
2. St. James's University Hospital; Department of Academic Medicine; Beckett Street Leeds UK LS9 7TF
3. University of Leeds; Centre for Epidemiology and Biostatistics; Worsley Building Rm 8.49 Leeds UK LS2 9JT
4. McMaster University; Department of Medicine, Division of Gastroenterology; Room 4W8E 1200 Main Street West Hamilton Ontario Canada L8N 3Z5
5. Medical School, University of Birmingham; Department of Pharmacology; Edgebaston Birmingham UK B15 2TT