[1] Royal Australasian Coll Surg, ASERNIP S, Adelaide, SA, Australia
[2] Univ Adelaide, Queen Elizabeth Hosp, Discipline Surg, Adelaide, SA, Australia
[3] Univ Sydney, Dept Surg, Nepean Clin Sch, Penrith, NSW, Australia
[4] Univ Auckland, Auckland City Hosp, Dept Surg, Auckland 1, New Zealand