[1] Univ Cape Town, Fac Hlth Sci, Groote Schuur Hosp, Dept Surg, ZA-7925 Cape Town, South Africa
[2] Univ Cape Town, Fac Hlth Sci, Groote Schuur Hosp, Surg Gastroenterol Unit, ZA-7925 Cape Town, South Africa
[3] Univ Cape Town, Fac Hlth Sci, Groote Schuur Hosp, Dept Radiol, ZA-7925 Cape Town, South Africa
[4] Univ Cape Town, Fac Hlth Sci, Groote Schuur Hosp, Dept Anat Pathol, ZA-7925 Cape Town, South Africa