1. Department of Rural Health, Faculty of Health and Medicine, The University of Newcastle, Coffs Harbour, New South Wales, Australia
2. Department of Rural Health, Faculty of Health and Medicine, The University of Newcastle, Tamworth, New South Wales, Australia
3. Priority Research Centre, Digestive Health, Callaghan, New South Wales, Australia
4. Faculty of Health and Medicine, The University of Newcastle, Callaghan, New South Wales, Australia
5. Galambila Aboriginal Health Service, Coffs Harbour, New South Wales, Australia