1. Pediatric Hematology and Oncology, University Hospital of J. W. Goethe University, Frankfurt/Main, Germany
2. Clinic of Pediatrics, Department 5, Klinikum Stuttgart – Olga Hospital, Stuttgart, Germany
3. Department of Pediatrics, M1 Oncology, University Hospital of Schleswig-Holstein, Campus Kiel, Germany
4. Clinic and Outpatient Department of Pediatrics, Pediatric Hematology and Oncology, University Hospital Münster, Germany
5. Department of Pediatrics, Helios-Klinikum Erfurt, Germany
6. Pediatric Hematology and Oncology, Medical University of Hannover, Germany