1. Department of Pediatric Hematology, Oncology and TransplantologyMedical University of Lublin Lublin Poland
2. Department of Pediatric Hematology, Oncology and Transplantology, Laboratory of Genetic DiagnosticsMedical University of Lublin Lublin Poland
3. Department of Applied PsychologyMedical University of Lublin Lublin Poland
4. Department of Hematology and PediatricsChildren's Hospital Warsaw Poland
5. Department of Pediatric Oncology and HematologyChildren's University Hospital, Jagiellonian University Kraków Poland
6. Department of Pediatric Transplantology, Oncology, HematologyMedical University of Wrocław Wrocław Poland
7. Department of Pediatric Oncology, Hematology and TransplantologyMedical University of Poznań Poznań Poland
8. Department of Pediatrics, Hematology, Oncology and EndocrinologyMedical University of Gdańsk Gdańsk Poland
9. Department of Pediatrics, Oncology, Hematology and DiabetologyMedical University of Łódź Łódź Poland
10. Department of Pediatrics, Hematology and OncologyCollegium Medicum of Bydgoszcz Bydgoszcz Poland
11. Department of Pediatrics, Hematology and OncologyMedical University of Zabrze Zabrze Poland
12. Department of Pediatric Oncology, HematologyMedical University of Białystok Białystok Poland
13. Department of Pediatrics, Hematology and OncologyMedical University of Szczecin Szczecin Poland
14. Department of Pediatric Oncology, Hematology and ChemotherapyMedical University of Katowice Katowice Poland
15. Department of Pediatric Oncology and HematologyChildren's Hospital Kielce Poland
16. Department of Pediatric Hematology and OncologyCharles University and University Hospital Motol Prague Czech Republic