1. Department of Pediatric Oncology and Hematology, Institute of Pediatrics, Jagiellonian University Medical College, 30-663 Krakow, Poland
2. Department of Pediatric Oncology and Hematology, University Children Hospital, 30-683 Krakow, Poland
3. Department of Medical Genetics, Institute of Pediatrics, Jagiellonian University Medical College, 30-663 Krakow, Poland
4. Department of Clinical Immunology, Institute of Pediatrics, Jagiellonian University Medical College, 30-663 Krakow, Poland
5. Department of Pediatrics, Oncology, Hematology and Transplantology, Medical University of Warsaw, 02-091 Warszawa, Poland
6. Department of Paediatric Haematology and Oncology and Transplantology, Medical University of Lublin, 20-095 Lublin, Poland
7. Department of Pediatric Oncology and Hematology, Medical University of Bialystok, 15-089 Bialystok, Poland
8. Department of Pediatrics, Hematology and Oncology, Medical University of Gdansk, 80-210 Gdansk, Poland
9. Department of Paediatrics, Hemato-Oncology and Gastroenterology, Pomeranian Medical University in Szczecin, 71-252 Szczecin, Poland
10. Department of Pediatric Hematology and Oncology, Collegium Medicum, Nicolaus Copernicus University Torun, Bydgoszcz, 85-094 Bydgoszcz, Poland
11. Department of Pediatric Oncology, Hematology and Transplantology, Poznan University of Medical Sciences, 60-572 Poznan, Poland
12. Department of Bone Marrow Transplantation, Pediatric Oncology and Hematology, Medical University of Wroclaw, 50-556 Wroclaw, Poland
13. Clinic of Pediatric Oncology and Hematology, State Hospital 2, 35-301 Rzeszów, Poland
14. Institute of Medical Sciences, Medical College of Rzeszow University, 35-959 Rzeszów, Poland
15. Department of Oncology, Hematology and Chemotherapy, Upper Silesia Children’s Care Health Centre, 40-752 Katowice, Poland
16. Department of Pediatrics, Medical University of Silesia, Upper Silesia Children’s Care Health Centre, 40-752 Katowice, Poland
17. Department of Pediatric Hematology and Oncology, Regional Polyclinic Hospital in Kielce, 25-736 Kielce, Poland
18. Department of Pediatrics, Oncology and Hematology, Medical University of Lodz, 91-738 Lodz, Poland
19. Department of Pediatrics and Hematology and Oncology, Province Children’s Hospital, 10-561 Olsztyn, Poland
20. Department of Pediatric Hematology and Oncology, Zabrze, Medical University of Silesia, 40-055 Katowice, Poland
21. Department of Pediatrics, Hematology and Oncology, City Hospital, 41-500 Chorzow, Poland
22. Student Scientific Group of Pediatric Oncology and Hematology, Jagiellonian University Medical College, 30-663 Krakow, Poland