1. The Prince Charles Hospital Department of Gastroenterology, , 627 Rode Road, Brisbane, Queensland 4032, Australia
2. University of Queensland Faculty of Medicine, , Mayne Medical School, 20 Weightman St, Brisbane, Queensland 4006, Australia
3. Pathology Queensland, The Prince Charles Hospital Department of Anatomical Pathology, , 627 Rode Road, Brisbane, Queensland 4032, Australia