1. Department of Pediatrics, Oncology, Hematology and Diabetology, Medical University of Lodz, Lodz, Poland;
2. Department of Pathology, Medical University of Lodz, Lodz, Poland;
3. Postgraduate School of Molecular Medicine, Medical University of Warsaw, Warsaw, Poland;
4. Department of Biostatistics and Translational Medicine, Medical University of Lodz, Lodz, Poland;
5. Department of Pediatric Hematology and Oncology, Medical University of Silesia, Zabrze, Poland;
6. Department of Pediatric Hematology and Oncology, Medical University of Warsaw, Warsaw, Poland;
7. Department of Pediatric Hematology, Oncology and Transplantology, University of Medical Sciences, Poznan, Poland;
8. Department of Pediatric Hematology and Oncology, Medical University of Lublin, Lublin, Poland;
9. Department of Pediatric Hematology, Oncology and Transplantology, Medical University of Wroclaw, Wroclaw, Poland;
10. Department of Pediatric Hematology and Oncology, Olsztyn, Poland;
11. Department of Pediatric Hematology and Oncology, Collegium Medicum, Nicolaus Copernicus University, Bydgoszcz, Poland;
12. Department of Pediatric Hematology, Gdansk Medical University, Gdansk, Poland;
13. Center for Human Genetics, KU Leuven, Leuven, Belgium