[1] Cameroon Baptist Convent Hlth Serv, Childhood Canc Program, Bamenda, Cameroon
[2] Stellenbosch Univ, Fac Med & Hlth Sci, Dept Pediat & Child Hlth, Cape Town, South Africa
[3] Tygerberg Hosp, Cape Town, South Africa
[4] Imperial Coll, Fac Med, Sch Publ Hlth, London, England
[5] Columbia Univ, Irving Med Ctr, Div Pediat Hematol Oncol Stem Cell Transplant, New York, NY USA
[6] McMaster Childrens Hosp, Div Pediat Hematol Oncol, Hamilton, ON, Canada
[7] McMaster Univ, Fac Hlth Sci, Dept Pediat, Hamilton, ON, Canada
[8] McMaster Univ, Fac Hlth Sci, Dept Hlth Res Methods Evidence & Impact, Hamilton, ON, Canada