[1] Univ Hosp Halle Saale, Dept Internal Med Oncol & Haematol, Halle, Germany
[2] Univ Canc Ctr, Dept Stem Cell Transplantat, Hamburg, Germany
[3] Univ Nigeria Teaching Hosp, Dept Hematol & Immunol, Enugu, Nigeria
[4] MLL Munich Leukemia Lab, Munich, Germany
[5] Univ Canc Ctr, Dept Med 2, Hamburg, Germany