[1] Vrije Univ Amsterdam, Med Ctr, Dept Pediat Oncol Hematol, NL-1081 HV Amsterdam, Netherlands
[2] Moi Teaching & Referral Hosp, Dept Child Hlth & Pediat, Eldoret, Kenya
[3] Gadjah Mada Univ, Dr Sardjito Hosp, Fac Med, Dept Pediat, Yogyakarta, Indonesia
[4] Gadjah Mada Univ, Dr Sardjito Hosp, Dept Pediat, Pediat Hematol Oncol Div, Yogyakarta, Indonesia