[1] Royal North Shore Hosp, Dept Gastrointestinal Surg, St Leonards, NSW, Australia
[2] Univ Sydney, Discipline Surg, Sydney, NSW, Australia
[3] Kolling Inst Med Res, Canc Diag & Pathol Grp, St Leonards, NSW, Australia
[4] Univ Sydney, Sydney, NSW, Australia
[5] Royal North Shore Hosp, Dept Anat Pathol, St Leonards, NSW, Australia
[6] Macquarie Univ, Macquarie Univ Hosp, N Ryde, NSW, Australia