1. Red Cross Transfusion Service of Upper Austria; Linz Austria
2. Institute of Clinical Transfusion Medicine and Immunogenetics Ulm; German Red Cross Blood Transfusion Service, Baden Wuerttemberg-Hessen; Ulm Germany
3. Institute of Transfusion Medicine; University of Ulm; Ulm Germany
4. Department for Blood Group Serology and Transfusion Medicine; Medical University of Vienna; Vienna Austria