1. Institute of Cell Biology (Cancer Research), University of Duisburg-Essen, Essen, Germany
2. Department of Haematology, University Hospital Essen, Essen, Germany
3. Institute for Transfusion Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
4. Division of Microbiology, Paul-Ehrlich-Institut, Langen, Germany
5. Institute of Medical Microbiology, University of Duisburg-Essen, Essen, Germany