1. Department of Haematology, Haemostasis, Oncology, and Stem Cell Transplantation, Hannover Medical School, Hannover, Germany
2. Institute for Clinical and Experimental Transfusion Medicine, Medical Faculty of Tuebingen, University Hospital of Tuebingen, Tuebingen, Germany
3. Department of Thrombosis and Haemostasis, Giessen University Hospital, Giessen, Germany
4. Institute for Clinical Immunology and Transfusion Medicine, Justus Liebig University, Giessen, Germany
5. Amedes WagnerStibbe Medical Laboratory, Hannover, Germany
6. Institute for Experimental Haematology and Transfusion Medicine, University of Bonn, Bonn, Germany