1. Department of Gastroenterology and Hepatology, St George Hospital, Sydney, New South Wales, Australia
2. St George Clinical School, University of New South Wales, Sydney, New South Wales, Australia
3. Speech Pathology Department, St George Hospital, Sydney, New South Wales, Australia
4. Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins Hospital, Baltimore, Maryland, USA
5. Department of Otolaryngology – Head and Neck Surgery, Johns Hopkins University, Baltimore, Maryland, USA
6. Department of Radiation Oncology, Cancer Care Centre, St George Hospital, Sydney, New South Wales, Australia