| Affiliation: | 1. Department of Immunohaematology, Centre of Postgraduate Medical Education, Warsaw, Poland;2. Outpatient Clinic for Congenital Anaemias, Institute of Haematology and Blood Transfusion, Warsaw, Poland;3. Department of Gastroenterology and Hepatology and Clinical Oncology, Centre of Postgraduate Medical Education, Warsaw, Poland;4. Department of Cancer Prevention, The Maria Sk?odowska‐Curie Memorial Cancer Centre and Institute of Oncology, Warsaw, Poland;5. Department of Paediatrics, Haematology and Oncology, Medical University of Warsaw, Warsaw, Poland;6. Department of Paediatrics, Medical Centre of Postgraduate Education, Bielanski Hospital, Warsaw, Poland |
