[1] Univ Cape Town, Red Cross War Mem Childrens Hosp, Paediat Haematol Oncol Serv, ZA-7925 Cape Town, South Africa
[2] Univ Cape Town, Red Cross War Mem Childrens Hosp, Natl Hlth Lab Serv, Serv Anat Pathol, ZA-7925 Cape Town, South Africa
[3] Univ Cape Town, Red Cross War Mem Childrens Hosp, Dept Paediat Surg, ZA-7925 Cape Town, South Africa