1. Klinikum Stuttgart‐Olgahospital Pediatrics 5 (Oncology, Hematology, Immunology) Stuttgart Germany
2. University of Tuebingen Tuebingen Germany
3. Department of Pediatric Oncology/Hematology Charité‐Universitätsmedizin Berlin Germany
4. Institute of Children's Pathology University of Bonn Bonn Germany
5. Department of Pediatric Hematology/Oncology and BMT University of Wroclaw Wroclaw Poland
6. Pediatric Oncology St. Anna Kinderspital Vienna Austria
7. Department of Pediatric Oncology University of Zürich Zurich Switzerland
8. Department of Women's and Children's Health Uppsala University Uppsala Sweden
9. Witten/Herdecke University Datteln Germany
10. Department of Pediatric Surgery University Children's Hospital Marburg Marburg Germany
11. Department of Pediatric Hematology and Oncology Hospital for Children and Adolescents University of Tuebingen Tuebingen Germany
12. Department for Children and Adolescents University Hospital Goethe University Frankfurt Germany