1 German Red Cross Blood Service Baden-Württemberg-Hessen, Institute of Transfusion Medicine and Immunohematology, Baden-Baden, Germany.
2 Institute of Transfusion Medicine and Immunology, Heidelberg University, Medical Faculty Mannheim, German Red Cross Blood Service Baden-Württemberg-Hessen, Mannheim, Germany.
3 Institute of Transfusion Medicine, University of Cologne, Cologne, Germany.
4 Bavarian Red Cross Blood Service, Munich, Germany.