[1] Sophia Childrens Univ Hosp, Eramus MC, Rotterdam, Netherlands
[2] AML BFM, Hannover, Germany
[3] DCOG, The Hague, Netherlands
[4] VU Med Ctr, Amsterdam, Netherlands
[5] Beatrix Children Hosp, Groningen, Netherlands
[6] St Louis Hosp, Paris, France
[7] Charles Univ Prague, Prague, Czech Republic