[1] Goethe Univ Frankfurt, Hosp Children & Adolescents, Frankfurt, Germany
[2] Univ Freiburg, Dept Pediat & Adolescent Med, Freiburg, Germany
[3] Univ Essen Gesamthsch, Childrens Hosp, Dept Pediat Hematol & Oncol, Essen, Germany
[4] Univ Jena, Dept Pediat, Jena, Germany
[5] Univ Schleswig Holstein, Dept Pediat, Kiel, Germany
[6] Univ Schleswig Holstein, BMT Unit, Kiel, Germany
[7] Tech Univ Munich, Dept Pediat, Munich, Germany
[8] Tech Univ Munich, POC, Munich, Germany
[9] Univ Munich, Dr von Haunersches Childrens Hosp, Munich, Germany
[10] Univ Childrens Hosp Muenster, Dept Pediat Hematol & Oncol, Munster, Germany
[11] Univ Med Ctr Hamburg Eppendorf, Dept Pediat Hematol & Oncol, Hamburg, Germany
[12] Julius Maximilian Univ Childrens Hosp, Dept Pediat Hematol & Oncol, Wurzburg, Germany
[13] Univ Erlangen Nurnberg, Univ Childrens Hosp, Dept Pediat Hematol & Oncol, Erlangen, Germany
[14] Univ Childrens Hosp Greifswald, Dept Pediat Hematol & Oncol, Greifswald, Germany
[15] Univ Halle Wittenberg, Clin & Polyclin Child & Adolescent Med, Halle, Saale, Germany
[16] Goethe Univ Frankfurt, Inst Biostat & Math Modeling, Frankfurt, Germany
[17] Univ Med Ctr, Dept Haematol Oncol, Regensburg, Germany