1. Divisions of Pathology and Laboratory Medicine and
2. Departments of Pathology and Pediatrics, The George Washington University Health Sciences, Washington, District of Columbia
3. Departments of Pathology, Immunology and Microbiology and Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee
4. Department of Pathology, Stanford University School of Medicine, Stanford, California
5. Biostatistics and Study Methodology, Children’s National Hospital, Washington, District of Columbia
6. Department of Clinical Immunology, Aalborg University Hospital, Aalborg, Denmark
7. Transfusion Research Center, Belgian Red Cross Flanders, Ghent, Belgium
8. Department of Diagnostic Sciences, Ghent University, Ghent, Belgium