Stuttgart Cancer Center, Stuttgart Cancer Center, Heinrich Heine University Dusseldorf, Semmelweis University, University of Hamburg - University Medical Center Hamburg-Eppendorf, Motol University Hospital, St. Anna Children's Cancer Research Institute (CCRI), University of Münster, Hannover Medical School, University Children's Hospital beider Basel, Stuttgart Cancer Center, Goethe University Frankfurt, University Hospital Ulm, Stuttgart Cancer Center, Friedrich-Alexander-Universität Erlangen-Nürnberg - Department of Pediatrics and Adolescent Medicine, Helios Klinikum Berlin-Buch, Universitätsklinikum Münster, Stuttgart Cancer Center, Technische Universität München (TUM), Medizinische Universität Wien and Stuttgart Cancer Center