1. Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, Department of Paediatric Oncology and Haematology, Berlin, Germany
2. Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, Department of Radiology, Berlin, Germany
3. Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Clinic of Vascular Surgery, Berlin, Germany
4. Städtisches Klinikum Braunschweig, Department of Pediatrics, Braunschweig, Germany
5. Medical Center, Faculty of Medicine, University of Freiburg, Department of Pediatrics and Adolescent Medicine, Division of Pediatric Hematology and Oncology, Freiburg, Germany