1. Department of Hematology and Oncology; University Hospital Mannheim, Heidelberg University; Heidelberg Germany
2. Institute of Pathology, Ludwig-Maximilians-University; Munich Germany
3. University Hospital Salzburg, Paracelsus Medical University; Salzburg Austria
4. Department of Internal Medicine I, Division of Hematology and Ludwig Boltzmann Cluster Oncology; Medical University of Vienna; Vienna Austria
5. MLL Munich Leukemia Laboratory; Munich Germany
6. Department of Human Genetics; Hannover Medical School; Hannover Germany
7. Faculty of Medicine; University of Southampton; Southampton United Kingdom
8. Wessex Regional Genetics Laboratory; Salisbury United Kingdom