1. Institute of Hematology and Transfusion Medicine; Warsaw Poland
2. Biologicals Quality Control; DDL Diagnostic Laboratory; Rijswijk the Netherlands
3. Regional Blood Center; Warsaw Poland
4. Regional Blood Transfusion Center; Łódź Poland
5. Regional Blood Transfusion Center; Krakow Poland. National Health Service Blood and Transplant; Cambridge Blood Centre; Cambridge United Kingdom. Lelie Research; Paris France