[1] Univ Western Australia, Sch Med & Pharmacol, Perth, WA 6009, Australia
[2] The Alfred, Dept Gastroenterol, Melbourne, Vic, Australia
[3] PathWest, Dept Anat Pathol, Perth, WA, Australia
[4] Univ Western Australia, Sch Surg, Perth, WA 6009, Australia
[5] Univ Western Australia, Sch Phys, Perth, WA 6009, Australia
[6] Sir Charles Gairdner Hosp, Dept Gastroenterol & Hepatol, Perth, WA, Australia