1. 1Pediatric Hematology/Oncology, ALL-BFM Study Group, Christian-Albrechts-University Kiel and University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany;
2. 2Division of Pediatric Oncology, and Children Research Center, University Childreńs Hospital, Zurich, Switzerland;
3. 3Division of Stem Cell Transplantation and Immunotherapy, Department of Medicine II, Christian-Albrechts-University Kiel and University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany;
4. 4Institute of Immunology, Christian-Albrechts-University Kiel, Kiel, Germany;
5. 5Department of Medicine II, Division of Antibody-Based Immunotherapy, Christian-Albrechts University Kiel and University Medical Center Schleswig-Holstein, Kiel, Germany;
6. 6Wolfson Childhood Cancer Research Centre, Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, United Kingdom;
7. 7Institute of Social Medicine and Epidemiology, University of Lübeck, Lübeck, Germany;
8. 8Department of Pediatrics, Hannover Medical School, Hannover, Germany;
9. 9Department of Transfusion Medicine, Cell Therapeutics and Hemostaseology, University Hospital, LMU Munich, Munich, Germany; and
10. 10Department of Pediatrics, Otto-von-Guericke University Magdeburg, Magdeburg, Germany