1. Klinikum Stuttgart, Zentrum für Kinder-, Jugend- und Frauenmedizin, Olgahospital; Pediatrics 5 (Pediatric Oncology, Hematology, Immunology); Stuttgart Germany
2. Department of Pediatric Surgery; University Childreńs Hospital; Marburg Germany
3. Kinder- und Jugendarztpraxis Dr. Konstatopoulos; Munich Germany
4. Institute of Paidopathology; University of Kiel; Kiel Germany
5. Klinikum Stuttgart, Zentrum für Kinder-, Jugend- und Frauenmedizin; Olgahospital, Institute of Radiology; Stuttgart Germany
6. Department of Women's and Children's Health; Uppsala University; Uppsala Sweden
7. Department of Pediatric Hematology and Oncology; University of Muenster; Muenster Germany
8. University of Frankfurt, Hospital for Children and Adolescents; Frankfurt/M. Germany
9. Department of Pediatric Surgery and Urology; University Childreńs Hospital; Tuebingen Germany
10. Department of Pediatric Hematology and Oncology; University Childreńs Hospital; Tuebingen Germany