1. Institute of Clinical Transfusion Medicine and Immunogenetics Ulm; German Red Cross Blood Transfusion Service Baden-Württemberg-Hessen; Ulm Germany
2. Institute of Transfusion Medicine; University of Ulm; Ulm Germany
3. Department of Pediatrics; Hospital Bethanien; Moers Germany
4. University Hospital of Essen; Department of Pediatrics; Essen Germany
5. Department of Transfusion Medicine; NIH Clinical Center, National Institutes of Health; Bethesda Maryland