1. Charité‐Universitätsmedizin Berlin Berlin Germany
2. Department of Paediatric Oncology, Haematology and ImmunologyMedical FacultyHeinrich‐Heine‐University of Düsseldorf Düsseldorf Germany
3. Berlin Institute of Health (BIH) Berlin Germany
4. University Hospital Essen Pediatrics IIIWest German Cancer Centre Essen Germany
5. German Cancer Research Centre (DKTK) Heidelberg Germany
6. Department of Pediatrics and Adolescent MedicineUniversity Medical Center Ulm Ulm Germany
7. University Hospital Brno and International Clinical Research Centre (FNUSA‐ICRC)Masaryk University Brno Czech Republic
8. Motol Teaching Hospital Prague Czech Republic
9. Medical University of Graz Austria
10. Lübeck Universitätsklinik Lübeck Germany
11. Medical University of Bialystok Białystok Poland
12. Department of Pediatrics, Hematology and OncologyMedical University of Gdansk Gdańsk Poland
13. Helios Kliniken Berlin‐Buch, Klinik für Kinder‐ und Jugendmedizin Berlin Germany
14. Boyne Research Institute Drogheda Ireland