[1] Univ Med Sci, Dept Pediat Hematol Oncol & TransplantolOncol & T, Poznan, Poland
[2] Univ Med Sci, Poznan, Poland
[3] Univ Children Hosp, Dept Pediat Oncol & Hematol, Krakow, Poland
[4] Wroclaw Med Univ, Clin Dept Pediat Bone Marrow Transplantat Oncol &, Wroclaw, Poland
[5] Med Univ, Dept Pediat Oncol & Hematol, Bialystok, Poland
[6] Med Univ, Dept Pediat Hematol & Oncol, Gdansk, Poland
[7] Reg Polyclin Hosp, Dept Pediat Hematol & Oncol, Kielce, Poland
[8] Med Univ, Dept Pediat Hematol Oncol & Transplantol, Lublin, Poland
[9] Prov Childrens Hosp, Dept Pediat & Hematol & Oncol, Olsztyn, Poland
[10] Pomeranian Med Univ, Dept Pediat HematoOncol & Gastroenterol, Szczecin, Poland
[11] Med Univ, Dept Oncol Pediat Hematol Transplantol & Pediat, Warsaw, Poland
[12] Silesian Univ Med, Dept Pediat Hematol & Oncol, Zabrze, Poland
[13] Med Univ Silesia, Katowice, Poland
[14] Clin Prov Hosp, Dept Pediat Oncohematol, Rzeszow, Poland
[15] Nicolaus Copernicus Univ Torun, Dept Pediat Hematol & Oncol, Coll Medicum, Bydgoszcz, Poland
[16] Pediat Ctr, Dept Pediat Hematol & Oncol, Chorzow, Poland
[17] Med Univ, Dept Pediat Oncol & Hematol, Lodz, Poland
[18] Uniwersytet Med Karola Marcinkowskiego, Klin Onkol Hematol & Transplantol Pediat, Poznan, Poland