1. Gastroenterology Department, John Hunter Hospital, Newcastle, Australia
2. School of Medicine and Public Health, The University of Newcastle, Newcastle, Australia
3. Radiology Department, John Hunter Hospital, Newcastle, Australia
4. Robarts Clinical Trials Inc., London, Ontario, Canada
5. Department of Gastroenterology, The Queen Elizabeth Hospital, Adelaide, Australia
6. Faculty of Health Sciences, School of Medicine, University of Adelaide, Adelaide, Australia
7. Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada
8. Department of Medicine, Division of Gastroenterology, Western University, London, Ontario, Canada