1. Department of Pediatrics; Hematology, Oncology & Diabetology, Medical University of Lodz; Lodz Poland
2. Department of Pediatric Hematology and Oncology; Medical University of Silesia; Zabrze Poland
3. Center for Human Genetics; KU Leuven; Leuven Belgium
4. Department of Pediatric Hematology and Oncology; Medical University of Lublin; Lublin Poland
5. Institute of Pharmaceutical Biology, Diagnostic Center of Acute Leukemia; University of Frankfurt; Frankfurt/Main Germany