1. Institute of Mathematical Optimization, Faculty of Mathematics, Otto-von-Guericke University Magdeburg, Germany
2. Department of Pediatrics and Adolescent Medicine, University Hospital Erlangen, Erlangen, Germany
3. Pediatric Hematology and Oncology, University Hospital Carl Gustav Carus, Dresden, Germany
4. Department of Pediatric Hemato–Oncology, Hannover Medical School, Hannover, Germany