[1] Sophia Childrens Univ Hosp, Erasmus Med Ctr, Dept Paediat Oncol & Haematol, Rotterdam, Netherlands
[2] Leiden Univ, Med Ctr, Dept Human & Clin Genet, NL-2300 RA Leiden, Netherlands
[3] St Jude Childrens Hosp, Div Pharmaceut Sci, Memphis, TN 38105 USA
[4] Erasmus MC, Dept Clin Genet, Rotterdam, Netherlands
[5] Dutch Childhood Oncol Grp, The Hague, Netherlands
[6] COALL Study Grp, Hamburg, Germany