1. Department of Pediatric Oncology, Hematology, and Clinical Immunology, Medical Faculty, Center for Child and Adolescent Health, University of Duesseldorf, Duesseldorf, Germany;
2. Department of Diagnostic and Interventional Radiology, Medical Faculty, University of Duesseldorf, Duesseldorf, Germany;
3. Department of Pathology, NYU School of Medicine, New York, NY, USA;
4. Clinic of Pediatric Hematology and Oncology, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany;
5. Department of Pediatrics, University Medical Centre Schleswig-Holstein, Kiel, Germany;
6. Department of Pediatrics, Evangelical Hospital, Bielefeld, Germany;
7. Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, Ulm, Germany;
8. Department of Pediatrics, University Hospital Rostock, Rostock, Germany;
9. Department of Pediatric Oncology/Hematology, Children’s Hospital Cologne, Cologne, Germany;
10. Pediatric Hematology and Oncology, Elisabeth-Hospital Oldenburg, Oldenburg, Germany