[1] Kisii Univ, Sch Hlth Sci, Dept Pharmacol, Kisii, Kenya
[2] Moi Teaching & Referral Hosp, Acad Model Providing Access Healthcare AMPATH, Eldoret, Kenya
[3] Vrije Univ Amsterdam, Amsterdam UMC, Emma Childrens Hosp, Paediat Oncol, Amsterdam, Netherlands
[4] Princess Maxima Ctr Paediat Oncol, Utrecht, Netherlands
[5] Moi Univ, Dept Paediat & Child Hlth, Eldoret, Kenya
[6] Indiana Univ Sch Med, Dept Pediat, Indianapolis, IN USA