1. Institute for Immunology and Transfusion Medicine; Universitätsmedizin Greifswald; Greifswald
2. Center for Clinical Transfusion Medicine; Universitätsklinikum Tübingen; Tübingen Germany
3. Department for Blood Group Serology and Transfusion Medicine; Medical University Vienna; Vienna Austria
4. Department of Clinical Chemistry and Hematology; University of Utrecht; Utrecht the Netherlands
5. Medical Clinic II; Municipal Hospital of Dresden; Dresden Germany
6. Aspen Germany GmbH; Munich Germany