1. Institute of Experimental Haematology and Transfusion Medicine, University Clinic Bonn, Bonn, Germany;
2. CSL Behring, King of Prussia, PA, USA;
3. Adivo Associates, San Francisco, CA, USA;
4. Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School, Hannover, Germany