1. Division of Gastroenterology, Department of Medicine, University of Western Ontario, London, Ontario, Canada
2. Cochrane IBD Group, University of Western Ontario, London, Ontario, Canada
3. Department of Gastroenterology, The Queen Elizabeth Hospital, Adelaide, Australia
4. Division of Digestive Diseases, UCLA School of Medicine, Los Angeles, California, USA
5. Robarts Clinical Trials Inc. London, Ontario, Canada
6. Department of Epidemiology and Biostatistics, University of Western Ontario, London, Ontario, Canada