[1] Hannover Med Sch, Inst Human Genet, Hannover, Germany
[2] Univ Hosp Muenster, Pediat Hematol & Oncol, Munster, Germany
[3] Ludwig Maximilians Univ Munchen, Dr von Hauner Childrens Hosp, Dept Pediat Hematol Oncol & Immunol, Munich, Germany
[4] Ludwig Maximilians Univ Munchen, Dr von Hauner Childrens Hosp, Munich, Germany
[5] Univ Freiburg, Univ Childrens Hosp Freiburg, Div Pediat Hematol & Oncol, Freiburg, Germany
[6] Univ Freiburg, Univ Childrens Hosp Freiburg, Div Pediat Hematol & Oncol, Freiburg, Germany