[1] Princess Maxima Ctr Pediat Oncol, Utrecht, Netherlands
[2] Sophia Childrens Univ Hosp, Dept Pediat Oncol, Erasmus MC, Rotterdam, Netherlands
[3] Univ Hosp Wales Cardiff, Univ Sch Med, Dept Cellular Pathol, Heath Pk, Cardiff, S Glam, Wales
[4] Childrens Natl Hlth Syst, Div Oncol, Washington, DC USA
[5] Hop Univ Est Parisien, Dept Pathol, Trousseau La Roche Guyon, France
[6] Med Univ Wroclaw, Dept Emergency Med, Wroclaw, Poland
[7] UCL, Canc Sect, Inst Child Hlth, London, England
[8] Saarland Univ, Dept Pediat Hematol & Oncol, Saarbrucken, Germany