1Department and Clinic of Pediatric Oncology, Haematology and Bone Marrow Transplantation, Wroclaw Medical University, Borowska 213, 50-556 Wroclaw, Poland
2Department of Pediatric Oncology and Hematology, Institute of Pediatrics, Jagiellonian University, Collegium Medicum, Kraków, Poland
3Department of Pediatric Oncology, Children’s Memorial Health Institute, Warsaw, Poland
4Department of Pediatrics, Hematology and Oncology, Medical University of Lodz, Lodz, Poland
5Department of Pediatrics, Hematology and Oncology, Medical University of Gdansk, Gdansk, Poland
6Department of Pediatric Hematology, Oncology and Transplantology, Medical University of Lublin, Lublin, Poland
7Department of Pediatric Oncology, Hematology and Transplantology, University of Medical Sciences, Poznan, Poland
8Department of Oncology, Pediatric Hematology, Transplantology and Pediatrics, Children’s Hospital, Medical University of Warsaw, Warsaw, Poland
9Department of Pediatrics, Medical University of Silesia, Katowice, Poland
10Clinic of Pediatric Oncology and Hematology, State Hospital 2 in Rzeszow, Rzeszow, Poland
11Department of Paediatrics, Institute of Medical Sciences, University of Rzeszow, Rzeszow, Poland
12Department of Pediatric Oncology and Hematology, Medical University of Bialystok, Białystok, Poland
13Department of Paediatrics, Paediatric Oncology and Immunology, Pomeranian Medical University, Szczecin, Poland
14Department of Oncology and Surgical Oncology for Children and Youth, Institute of Mother and Child, Warsaw, Poland
15Department of Pediatric Hematology and Oncology, Zabrze, Medical University of Silesia, Katowice, Poland
16Department and Clinic of Pediatric Infectious Diseases, Wroclaw Medical University, Wroclaw, Poland
17Department of Pediatric Hematology and Oncology, Jurasz University Hospital, Collegium Medicum Nicolaus Copernicus University Torun, Bydgoszcz, Poland
18Department of Pediatrics, Hemato-Oncology and Gastroenterology, Pomeranian Medical University, Szczecin, Poland
