[1] Charles Univ Prague, Fac Med 2, Dept PAediat Haematol & Oncol, Prague, Czech Republic
[2] Motol Univ Hosp, Prague, Czech Republic
[3] Inst Hematol & Blood Transfus, Prague, Czech Republic
[4] Grp Hosp Pitie Salpetriere, Virol Dept, F-75634 Paris, France
[5] Univ Hosp Hradec Kralove, Dept Clin Biochem & Diagnost, Hradec Kralove, Czech Republic
[6] Univ Hosp Hradec Kralove, Dept Hematol & Internal Med, Hradec Kralove, Czech Republic
[7] Motol Univ Hosp, Dept Paediat Haematol & Oncol, Prague, Czech Republic