1. Department of Hematology and Stem Cell Transplantation West German Cancer Center, University Hospital Essen Essen Germany
2. Institute of Pathology and Neuropathology University Hospital Essen Essen Germany
3. MVZ Dr. Eberhard & Partner Dortmund Germany
4. Institute for Virology University Hospital Essen, University of Duisburg‐Essen Essen Germany
5. Institute for Transfusion Medicine University Hospital Essen, University of Duisburg‐Essen Essen Germany
6. Department of Hematology, Oncology and Tumor Immunology Charité University Medicine Berlin Germany
7. German Society of Hematology and Medical Oncology Berlin Germany