[1] Childrens Mem Hlth Inst, Dept Oncol, Warsaw, Poland
[2] Childrens Mem Hlth Inst, Dept Patol, Warsaw, Poland
[3] Childrens Mem Hlth Inst, Dept Neurosurg, Warsaw, Poland
[4] Med Univ, Dept Oncol Hematol & Chemotherapy, Katowice, Poland
[5] Med Univ, Dept Oncol Hematol & Pediat Transplantol, Poznan, Poland
[6] Pomeranian Med Univ, Dept Pediat Hematol & Oncol, Szczecin, Poland
[7] Med Univ, Dept Pediat & Oncohematol, Lodz, Poland
[8] Nicholas Copernicus Univ, Dept Pediat Hematol & Oncol, Coll Med, Bydgoszcz, Poland
[9] Wroclaw Med Univ, Dept Pediat Hematol Oncol & Bone Marrow Transplan, Wroclaw, Poland
[10] Jagiellonian Univ, Dept Pediat Hematol & Oncol, Coll Med, Krakow, Poland
[11] Med Univ, Dept Pediat Hematol & Oncol, Lublin, Poland