1. Department of Pediatrics and Children's Cancer Research Center, TUM School of Medicine, Kinderklinik München Schwabing Technical University of Munich Munich Germany
2. Department of Sport and Health Sciences, Chair of Preventive Pediatrics Technical University of Munich Munich Germany
3. Pediatric Oncology Network KIONET BAVARIA Bavaria Germany
4. Department of Hematology and Oncology, Clinic of Pediatrics III, West German Cancer Center Essen University Hospital Essen Germany
5. Department of Pediatric Hematology, Oncology, Hemostaseology and Stem Cell Transplantation, Dr. von Hauner Children's Hospital, University Hospital LMU Munich Munich Germany