[1] Univ Hosp, Dept Paediat Haematol & Oncol, Bonn, Germany
[2] Inst Paediat Haematol & Oncol IHOPe, Dept Paediat Haematol & Oncol, Lyon, France
[3] Univ Hosp, Dept Radiotherapy & Radiooncol, Leipzig, Germany
[4] Univ Hosp, Dept Radiotherapy & Radiooncol, Cambridge, England
[5] Univ Bonn, Inst Neuropathol, Med Ctr, Bonn, Germany
[6] Hosp Civiles, Inst Multisite Pathol, Dept Biopathol, Lyon, France
[7] Univ Turin, Dept Oncol, Turin, Italy
[8] Inst Paediat Haematol & Oncol IHOPe, Dept Paediat Haematol & Oncol, Lyon, France
[9] Clin Proton Therapy, Dept Radiat Oncol, Essen, Germany
[10] Curie Inst, Dept Radiat Oncol, Paris, France
[11] Cambridge Univ Hosp NHS Fdn Trust, Dept Paediat Haematol & Oncol, Cambridge, England
[12] Gaslini Childrens Hosp, Dept Paediat Haematol & Oncol, Genoa, Italy