1. Department of Pediatric Oncology, Hematology and Transplantology University of Medical Sciences Poznan Poland
2. Department of Pediatric Stem Cell Transplantation, Hematology and Oncology Medical University Wroclaw Poland
3. Department of Pediatric Hematology and Oncology, Collegium Medicum Nicolaus Copernicus University Torun Bydgoszcz Poland
4. Department of Microbiology, Collegium Medicum Nicolaus Copernicus University Torun Poland
5. Department of Pediatric Hematology and Oncology Medical University Torun Bydgoszcz Poland
6. Department of Pediatrics, Hematology and Oncology Medical University Gdansk Poland
7. Department of Pediatric, Division of Pediatric Oncology, Hematology and Chemotherapy Silesian Medical University Katowice Poland
8. Department of Pediatric Oncology, Hematology and Diabetology Medical University Lodz Poland
9. Department of Oncology Children's Memorial Health Institute Warszawa Poland
10. Department of Microbiology Children's Memorial Health Institute Warszawa Poland
11. Division of Pediatric Hematology and Oncology Chorzow Pediatric and Oncology Center Chorzow Poland
12. Division of Pediatric Hematology and Oncology Children Hospital Kielce Poland
13. Department of Pediatric Oncology and Hematology Medical University Bialystok Poland
14. Department of Pediatric Hematology, Oncology and Stem Cell Transplantation Medical University Lublin Poland
15. Department of Clinical Immunology and Transplantology, Stem Cell Transplant Center University Children's Hospital, Jagiellonian University Collegium Medicum Krakow Poland