[1] Univ Hosp Bonn, Dept Pediat Hematol & Oncol, Bonn, Germany
[2] Univ Hosp Essen, West German Ctr Proton Therapy, Essen, Germany
[3] Inst Curie, Dept Radiat Oncol, Paris, France
[4] Univ Hosp Augsburg, Dept Neuroradiol, Augsburg, Germany
[5] IHOPE, Dept Neurooncol, Lyon, France
[6] Univ Hosp Cambridge, Clin Oncol, Cambridge, England
[7] Univ Childrens Hosp Zurich, Dept Oncol, Zurich, Switzerland
[8] Med Univ Vienna, Dept Pediat & Adolescent Med, Vienna, Austria
[9] Univ Turin, Dept Radiat Oncol, Turin, Italy
[10] Univ Cambridge, Dept Pathol, Cambridge, England
[11] Univ Hosp Essen, Dept Pediat Hematol & Oncol, Essen, Germany
[12] Inst Curie, Dept Radiol, Paris, France
[13] Hannover Med Sch, Dept Pediat Hematol & Oncol, Hannover, Germany
[14] Univ Hosp Cambridge, Dept Pediat Hematol & Oncol, Cambridge, England
[15] Univ Hosp Cambridge, IHOPE Dept Pediat Hematol & Oncol, Pediat Oncol, Lyon, France