1. Department of Pediatric Oncology and HematologyMedical University of Bialystok Bialystok Poland
2. Department of Pediatric Hematology and Oncology and Hematopoietic Stem Cell Transplantation, Institute of PediatricsUniversity of Medical Sciences Poznan Poland
3. Department and Clinic of Pediatric Oncology, Hematology and Bone Marrow TransplantationWroclaw Medical University Wroclaw Poland
4. Department of Pediatrics, Hematology and OncologyMedical University of Gdansk Gdansk Poland
5. Department of Pediatric Hematology and OncologyMedical University of Warsaw Warsaw Poland
6. Department of Pediatric Hematology and Oncology, Collegium MedicumNicolaus Copernicus University Bydgoszcz Poland
7. Department of Pediatric Hematology and OncologyMedical University of Silesia Zabrze Poland
8. Department of Hematology and OncologyChildren State Hospital Olsztyn Poland
9. Department of Pediatric Hematology/OncologyMedical University Lublin Poland
10. Department of Pediatrics, Hematology and OncologyPomeranian Medical University Szczecin Poland
11. Department of Pediatric Oncology and HematologyW. Buszkowski Children's Hospital Kielce Poland
12. Department of Pediatric Laboratory DiagnosticsMedical University of Bialystok Białystok Poland