1. Department of Pediatric Hematology Medical Faculty Uludag University Nilüfer Bursa Turkey
2. Pediatric Oncology Unit University Hospital Poitiers France
3. Department of Pediatric Hematology Oncology and BMT Wroclaw Medical University Wroclaw Poland
4. Department of Pediatric and Adolescent Medicine University of Copenhagen Copenhagen Denmark
5. Department of Pediatric Hematology and Oncology University Hospital Motol Prague Czech Republic
6. Department of Blood and Marrow Transplantation Princess Máxima Center for Pediatric Oncology Utrecht The Netherlands
7. Children's Cancer Research Institute and St. Anna Children's Hospital Pediatric Clinic Medical University of Vienna Vienna Austria
8. Department of Pediatric Hematology‐Oncology Ghent University Hospital Ghent Belgium
9. Medical Faculty Pediatric Hematology‐Oncology Technical University of Dresden Dresden Germany