1. Department of Radiology, Bankstown-Lidcombe Hospital, Sydney, NSW, Australia
2. University of New South Wales, Sydney, NSW, Australia
3. Department of Pathology, Liverpool Hospital, Sydney, NSW, Australia
4. Department of Gastroenterology, Bankstown-Lidcombe Hospital, Sydney, NSW, Australia
5. Department of Radiology, Westmead Hospital, Sydney, NSW, Australia