[1] Childhood Leukaemia Invest Prague, Prague, Czech Republic
[2] Charles Univ Prague, Fac Med 2, Dept Paediat Haematol & Oncol, Prague, Czech Republic
[3] Rigshosp, Dept Pediat & Adolescent Med, Univ Hosp, Copenhagen, Denmark
[4] Charles Univ Prague, Fac Med 2, Dept Dermatovenereol, Prague, Czech Republic
[5] Univ Hosp Motol, Prague, Czech Republic
[6] Univ Copenhagen, Inst Clin Med, Fac Med, Copenhagen, Denmark