1. Institute for Clinical Chemistry and Laboratory Medicine; University Hospital of Regensburg; Regensburg Germany
2. Institute of Transfusion Medicine and Transplantation Immunology, University Hospital Muenster; Muenster Germany
3. Institute of Transfusion Medicine, Charité University Medical Centre; Berlin Germany
4. Department for Health Sciences and Biomedicine; Danube University Krems; Krems Austria
5. Regional Blood Transfusion Service Zurich SRK; Zurich Switzerland