[1] Heinrich Heine Univ, Fac Med, Div Pediat Stem Cell Therapy, Clin Pediat Oncol Hematol & Clin Immunol, Dusseldorf, Germany
[2] Hannover Med Sch, Dept Pediat Hematol & Oncol, Dusseldorf, Germany
[3] Heinrich Heine Univ, Inst Virol, Dusseldorf, Germany
[4] Univ Hosp Tubingen, Childrens Hosp, Tubingen, Germany
[5] Hannover Med Sch, Inst Transfus Med, Hannover, Germany