[1] Radboudumc, Dept Pediat Hematol & Oncol, Nijmegen, Netherlands
[2] ErasmusMC Sophia Childrens Hosp, Dept Pediat Hematol & Oncol, Rotterdam, Netherlands
[3] Emma Childrens Hosp, Dept Pediat Oncol, Amsterdam, Netherlands
[4] Dutch Canc Inst NKI AvL, Dept Stat, Amsterdam, Netherlands
[5] Cardiff Univ, Sch Med, Dept Pathol, Cardiff CF10 3AX, S Glam, Wales
[6] UCL, Inst Child Hlth, London, England
[7] Alder Hey Childrens NHS Fdn Trust, Dept Pediat Oncol, Liverpool, Merseyside, England
[8] Univ Saarland, Homburg, Germany
[9] Inst Hematol & Oncol Pediat, Lyon, France
[10] Hosp Maternoinfantil, Dept Pediat Oncol, Malaga, Spain
[11] Fdn IRCCS Ist Nazl Tumori, Dept Hematol & Pediat Oncol, Pediat Oncol Unit, Milaan, Italy