1. 1Department of Pediatrics, Hematology, Oncology and Endocrinology, Medical University of Gdansk, Debinki 7, 80-210, Gdansk, Poland
2. 2Department of Pediatric Cardiac Surgery, Pomeranian Centre of Traumatology, Nowe Ogrody 1-6, 80-210, Gdansk, Poland
3. 3Department of Clinical Microbiology, Clinical Center of Medical University of Gdansk, Debinki 7, 80-210, Gdansk, Poland