[1
]
Department of Pediatric Oncology and Hematology, Medical University of Bialystok,
Bialystok, Poland. Electronic address: kmroslan@umb.edu.pl.
[2
]
Department of Pediatric Oncology and Hematology, Medical University of Bialystok,
Bialystok, Poland.
[3
]
Department of Pediatrics and Developmental Disorders, Medical University of Bialystok,
Bialystok, Poland.
[4
]
Student's Scientific Society by the Department of Pediatric Oncology and Hematology,
Medical University of Bialystok, Bialystok, Poland.