[1] Erasmus Univ, Med Ctr, Sophia Childrens Hosp, Pediat Oncol, Rotterdam, Netherlands
[2] Dutch Childhood Oncol Grp, Pediat Oncol, The Hague, Netherlands
[3] Leiden Univ, Med Ctr, Dept Med Stat & Bioinformat, Leiden, Netherlands
[4] Radboud Univ Nijmegen, Med Ctr Nijmegen, Dept Pediat Hematooncol, NL-6525 ED Nijmegen, Netherlands
[5] Univ Groningen, Beatrix Childrens Hosp, Dept Pediat Oncol Hematol, Groningen, Netherlands
[6] Univ Med Ctr Utrecht, Dept Pediat Hematooncol, Utrecht, Netherlands
[7] Leiden Univ, Med Ctr, Dept Pediat Hematooncol, Leiden, Netherlands
[8] Sophia Childrens Univ Hosp, Erasmus MC, Radiol, Rotterdam, Netherlands
[9] Vrije Univ Amsterdam, Dept Pediat Hematooncol, Med Ctr, Amsterdam, Netherlands
[10] Princess Maxima Ctr, Oncol, Utrecht, Netherlands