[1] Gustave Roussy, Dept Paediat Oncol, F-94805 Villejuif, France
[2] Univ Paris Saclay, Gif Sur Yvette, France
[3] European Soc Paediat Oncol SIOP Europe, Brussels, Belgium
[4] Univ Milano Bicocca, MBBM Fdn, Haematol Oncol Unit, ASST Monza, Monza, Italy
[5] Med Univ Silesia, Paediat Haematol & Oncol Dept, Zabrze, Poland
[6] Med Univ Vienna, St Anna Childrens Hosp, Vienna, Austria
[7] Med Univ Vienna, Childrens Canc Res Inst, Dept Studies & Stat Integrated Res & Projects, Vienna, Austria
[8] Med Univ Vienna, Dept Paediat, Vienna, Austria
[9] Univ Birmingham, Natl Inst Hlth Res Birmingham Biomed Res Ctr, Inst Canc & Genom Sci, Canc Res UK Clin Trials Unit, Birmingham, England