1. Medical University of Vienna, Department of Internal Medicine I, Division of Hematology and Blood Coagulation, Vienna, Austria;
2. Institute of Hematology, Clinical Center of Serbia, Belgrade, Serbia;
3. Silesian Medical University, Department of Hematology and BMT, Katowice, Poland;
4. University Hospital Brno, Department of Clinical Hematology, Brno, Czech Republic;
5. Institute of Pathology, University of Cologne, Cologne, Germany;
6. Department of Pathology, University of Frankfurt/Main, Frankfurt/Main, Germany;
7. Center for Molecular Medicine (CeMM), Austrian Academy of Sciences, Vienna, Austria; and
8. Hematology Oncology Center and Ludwig Maximilians University of Munich Medical School, Munich, Germany