[1] Med Univ Silesia, Dept Pediat Hematol & Oncol, Zabrze, Poland
[2] Childrens Univ Hosp, Lublin, Poland
[3] Goethe Univ Frankfurt, Inst Pharmaceut Biol, Diagnost Ctr Acute Leukemia, Frankfurt, Germany
[4] Med Univ Warsaw, Dept Pediat Hematol & Oncol, Warsaw, Poland
[5] Wroclaw Med Acad, Dept Bone Marrow Transplant Pediat Hematol & Onco, Wroclaw, Poland
[6] Miko3aj Kopernik Univ, Coll Med Bydgoszcz, Dept Clin Genet, Bydgoszcz, Poland
[7] Miko3aj Kopemik Univ, Coll Med Bydgoszcz, Dept Pediat Hematol & Oncol, Bydgoszcz, Poland
[8] Univ Med Sci, Dept Pediat Hematol Oncol & Transplantol, Poznan, Poland
[9] Med Univ, Dept Pediat Hematol Oncol & Endocrinol, Gdansk, Poland
[10] Pomeranian Med Univ, Dept Pediat Hematol & Oncol, Szczecin, Poland
[11] Chorzow Ctr Pediat & Oncol, Chorzow, Poland
[12] Med Univ, Dept Pediat Oncol, Bialystok, Poland
[13] Med Univ Silesia, Dept Pediat, Katowice, Poland
[14] Jagiellonian Univ, Coll Med, Dept Pediat Oncol & Hematol, Krakow, Poland
[15] Reg Specialist Pediat Hosp, Kielce, Poland
[16] Reg Specialist Pediat Hosp, Olsztyn, Poland
[17] Med Univ, Dept Pediat Hematol & Oncol, Lublin, Poland
[18] Med Univ Silesia, Dept Internal Dis Diabetol & Nephrol, Zabrze, Poland