1. Histocompatibility and Immunogenetic Laboratory; Red Cross Flanders; Mechelen Belgium
2. Blood Transfusion Service Zürich; Swiss Red Cross; Schlieren Switzerland
3. Department of Transfusion Medicine; University of Göttingen; Göttingen Germany
4. ZNA Stuivenberg; Antwerp Belgium
5. Department of Blood Group Serology and Transfusion Medicine; Medical University of Vienna; Vienna Austria