1. Department of Pathology, Microbiology and Immunology; Vanderbilt University Medical Center; Nashville Tennessee
2. Department of Medicine; Vanderbilt University Medical Center; Nashville Tennessee
3. Department of Veterans Affairs; Nashville Tennessee
4. Institute for Transfusion Medicine and Immunohematology; German Red Cross Blood Donor Service Baden-Württemberg-Hessen gGmbH; Johann-Wolfgang-Goethe-University Hospital; Frankfurt am Main Germany