German Red Cross Blood Transfusion Service and Goethe University Clinics, Frankfurt/Main. Department of Hematology and Oncology, University Hospital Frankfurt, Goethe University, Frankfurt/Main. German Red Cross Blood Service NSTOB, Springe. Department of Oncology and Hematology, University Hospital, Oldenburg. Department of Hematology and Oncology, Municipal Hospital Bremen, Bremen. Department of Hematology and Oncology, University Hospital, Mannheim. Medical Clinic I, Department of Hematology and Oncology, University Hospital, Carl Gustav Carus Faculty of Medicine, Dresden. Department of Hematology and Oncology, Municipal Hospital, Osnabrück. Department of Hematology and Oncology, Municipal Hospital Frankfurt-Hoechst, Frankfurt/Main. Department of Internal Medicine III, University Hospital, Ulm. Department of Hematology and Oncology, Municipal Hospital, Kassel. Institute for Transfusion Medicine, University Hospital Ulm, Ulm, Germany; and Institute for Clinical Transfusion Medicine and Immunogenetics Ulm, German Red Cross Blood Service Baden-Württemberg - Hessia, Ulm. Institute for Immunology and Transfusion Medicine, University Medicine, Greifswald. German Red Cross Blood Service NSTOB, Oldenburg. German Red Cross Blood Service NSTOB, Springe, Germany; Bavarian Red Cross Blood Service, Nuremberg. a.seltsam@blutspendedienst.com.