[1] Vrije Univ Amsterdam, Med Ctr, Dept Paediat Oncol, Amsterdam, Netherlands
[2] Princess Maxima Ctr Paediat Oncol, Dept Paediat Oncol, Utrecht, Netherlands
[3] Emma Childrens Hosp, Psychosocial Dept, Acad Med Ctr, Amsterdam, Netherlands
[4] Sophia Childrens Univ Hosp, Dept Paediat Oncol, Eramus Med Ctr, Rotterdam, Netherlands
[5] Radboud Univ Nijmegen, Med Ctr, Dept Paediat Oncol, Nijmegen, Netherlands
[6] Emma Childrens Hosp, Dept Paediat Oncol, Acad Med Ctr, Amsterdam, Netherlands
[7] Univ Med Ctr Groningen, Dept Paediat Oncol, Groningen, Netherlands
[8] Dutch Childhood Oncol Grp, The Hague, Netherlands