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[\'Department of Pediatric Bone Marrow Transplantation, Oncology, and Hematology, Wroclaw Medical University, Wroclaw, Poland.\', \'Department of Pediatric Oncohematology, Medical Faculty University of Rzeszow, Clinical Provincial Hospital No. 2, Rzeszow, Poland.\', \'Clinic of Pediatric Oncology and Hematology, Faculty of Medicine, University of Rzeszow, Rzeszow, Poland.\', \'Department of Pediatrics, Oncology and Hematology, Medical University of Lodz, Lodz, Poland.\', \'Department of Pediatric Bone Marrow Transplantation, Oncology, and Hematology, Wroclaw Medical University, Wroclaw, Poland. Electronic address: krzysztof.kalwak@gmail.com.\']
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