Division of General Internal Medicine, Department of Medicine, Rutgers Robert Wood Johnson Medical School, New Brunswick, New Jersey, USA. Division of Transfusion Medicine, Department of Pathology, Johns Hopkins Hospital, Baltimore, Maryland, USA. Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, USA. Division of Hematology, Department of Medicine, Rutgers Robert Wood Johnson Medical School, New Brunswick, New Jersey, USA. Department of Pathology and Immunology, Baylor College of Medicine, Houston, Texas, USA. Department of Epidemiology and Biostatistics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania, USA. Department of Radiology, Rutgers Robert Wood Johnson Medical School, New Brunswick, New Jersey, USA. Division of Transfusion Medicine, Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.