[1] Princess Maxima Ctr Pediat Oncol, Pediat Oncol, Utrecht, Netherlands
[2] Univ Med Ctr Utrecht, Utrecht Canc Ctr, Utrecht, Netherlands
[3] Newcastle Univ, Inst Canc, Newcastle Upon Tyne, Tyne & Wear, England
[4] Leiden Univ, Math Inst, Leiden, Netherlands
[5] Sophia Childrens Univ Hosp, Dept Pediat Physiotherapy, Erasmus Med Ctr, Rotterdam, Netherlands