[1] Univ Western Australia, Dept Gastroenterol & Hepatol, Perth, WA, Australia
[2] Univ Western Australia, Dept Colorectal Surg, Perth, WA, Australia
[3] Univ Western Australia, Dept Clin Serv, Fiona Stanley Hosp, Perth, WA, Australia
[4] Univ Western Australia, Med Sch, Perth, WA, Australia