[1] Vrije Univ, Amsterdam UMC, Emma Childrens Hosp, Amsterdam, Netherlands
[2] Princess Maxima Ctr Pediat Oncol, Utrecht, Netherlands
[3] Moi Univ, Moi Teaching & Referral Hosp, Dept Child Hlth & Pediat, Eldoret, Kenya
[4] Vrije Univ Amsterdam, Med Lib, Amsterdam, Netherlands